The Search for the Fundamental

Motion of gas molecules Español: Animación mos...

Motion of gas molecules Español: Animación mostrando la agitación térmica de un gas. Cinco partículas han sido coloreadas de rojo para facilitar el seguimiento de sus movimientos. Русский: Хаотическое тепловое движение на плоскости частиц газа таких как атомы и молекулы (Photo credit: Wikipedia)

When does it stop? This screen that I am looking at, the keyboard that I am typing on, the invisible air between my eyes and the screen, even my body, all are composed of atoms, I told and believe. Apart from atoms, all there is is radiation, of various sorts.

The ancient Greek philosophers didn’t know about atoms so proposed various theories, which today seem quaint, but eventually they came around to atomism, and abandoned the other theories. In particular the theory of the four classical elements, earth, fire, water and air was dropped.

The four classical elements, after Aristotle. ...

The four classical elements, after Aristotle. Чотири стихії (за Арістотелем) (Photo credit: Wikipedia)

As I said, the theory now sounds quaint, but, given that the ancient Greek philosophers were not of an experimental frame of mind, the four classical elements could explain much of what could be observed. Everything could have been a mixture of these elements in various proportions.

After all, it appeared to work for colours – all colours that can be displayed on a computer screen can be specified in terms of the amount of the three primary colours of red, green and blue that a single pixel or dot on the screen emits. Why shouldn’t this scheme work for other things than light?

Barycentric RGB

Barycentric RGB (Photo credit: Wikipedia)

However Greek philosophers (and of course, philosophers in other cultures) noticed that, while some things could be broken down into component parts – sugar could be melted and burned, water could be driven off to leave the salts behind, and more importantly alcohol could be evaporated off and collected to make spirits, some things could not be broken down.

Gold, sulphur and phosphorus stubbornly refused to separate into earth, air, water or fire. Of course such stubbornness could be explained by the classical element theory – after all some things are easier to break down than others, but the Greeks eventually dropped the theory in favour of atomism. (This and what follows is highly simplified and condensed).

(Click here for rotating model)

(Click here for rotating model) (Photo credit: Wikipedia)

This is the belief that everything is made up of small indivisible particles which differ from element to element. The lump of gold contains billions of gold atoms, while the sulphur block contains sulphur atoms.

From about the start of the scientific revolution, people started to work out the rules of chemistry, and the ‘why’ of chemical reactions. Why did carbon in coal burn away and leave an ash? We know that the carbon in the coal burns using the oxygen in the air and creates oxides of carbon which are gasses and not easily detectable, but the experiments which led to this knowledge were preformed in the era of the scientific revolution.

So, matter is composed of atoms. That seemed to be the end of the story, as the vast majority of chemical experiments could be explained in terms of atoms, but exactly why atom A reacts in fixed proportions with atom B, but won’t have a bar of atom C. These relationships were noted but not really explained.

By the middle of the 19th century scientists began to detect problems with the “atoms as billiard balls” model. Electrons were discovered and soon related to chemistry, answering the above question. The new model, “atoms as small planetary-like systems”, had a small positively charged, and solid nucleus surrounded by a swarm of negatively charged electrons, with the electrons taking a major role in determining the chemistry of the atom.

It was discovered that many elements behaved as if each atoms of the element weighed the same, but some elements broke this rule. The gas Chlorine for example has an atomic weight of 35.45. In other words each atom weighed about 35 and half times as much as a Hydrogen atom.

It was eventually discovered that not all Chlorine atoms weighed the same. Most had an atomic weight of 35 but some (about half) had a weight of 36. To cut a long story short it was discovered that the supposedly solid nucleus was composed of a collection of other particles called protons and neutrons.

English: Liquid Chlorine in flask for analysis.

English: Liquid Chlorine in flask for analysis. (Photo credit: Wikipedia)

While the number of protons and electrons determine the chemistry of an atom almost completely, the number of neutrons contribute mass to the atom and barely affect the chemistry.

While electrons appear to be truly fundamental particles and cannot be broken down further, the protons and neutrons are composed of particles called quarks. For reasons mentioned in the Wikipedia article quarks cannot be found in isolation, but are only found in other particles.

English: The quark structure of the proton. Th...

English: The quark structure of the proton. There are two up quarks in it and one down quark. The strong force is mediated by gluons (wavey). The strong force has three types of charges, the so-called red, green and the blue. Note that the choice of green for the down quark is arbitrary; the “color charge” is thought of as circulating among the three quarks. (Photo credit: Wikipedia)

In addition to protons and neutrons, quarks make up other sub-atomic particles such as mesons. Scientists have discovered or postulated bosons which are particles that bind quarks and other fundamental particles together. From then on, things get complicated!

I haven’t mentioned the photon, which is bosonic, or the neutrino which is a fermion. All fundamental particles fit into one of these two families, and all sub-atomic interactions are the result of the rather incestuous exchange of these particles in their various groups and a strict set of rules. So far so good.

English: Enrico Fermi

English: Enrico Fermi (Photo credit: Wikipedia)

However, there are still questions to be answered. Are these particles truly fundamental or do they have components, which may or may not be particles in the classical sense? What are the sizes of these particles, if such a concept is appropriate at this level? Have we found them all? What about dark matter?

Scientists have abandoned the first question. They don’t generally refer to particles as fundamental. They have seen a long list of fundamental particles turn out to be not so fundamental after all.

Sizes of the particles may not make sense at the particle level, but the various theories may indicate sizes for some of them. There are difficulties over the size of the electron for instance. If it were a point object rather than having something that equates to size, then that causes difficulties with some theories.

As for the third and fourth questions, it appears that scientists may have found all the particles that explain ordinary matter, but naturally cautious, they don’t rule out other forms of matter such as the so called “dark matter” and “dark energy“. Dark matter and dark energy apparently interact with gravity and (from the Wikipedia article) and the Weak Nuclear Interaction.

pie chart of dark matter and normal energy rat...

pie chart of dark matter and normal energy ratio taken from en.wikipedia (Photo credit: Wikipedia)

My original question was “When does it stop?” By this I meant, which particles are truly fundamental and which have components that determine their properties? This question remains open, but if you have followed through my exposition, you will probably see that this is a question without an easy answer.

 

Posted in Computing, General, Internet, Philosophy, Science, Society, Uncategorized | Tagged , , , , , , , , , , | Leave a comment

Mainframes were different

IBM System 360/65 Operator's Panel The IBM Sys...

IBM System 360/65 Operator’s Panel The IBM System/360 Model 65 first shipped in 1966 This photo was taken by Mike Ross of corestore.org . He has given permission via email “Feel free to make use of … my pictures under the GNU license. All I ask is that they are credited & linked…”. –agr 19:07, 17 Aug 2004 (UTC) (Photo credit: Wikipedia)

Mainframes were … different. Today we have devices that have orders of magnitude more processing power than the old mainframes. The old mainframes were big machines that performed business tasks for large organisations and that cost millions of dollars. The phone in your pocket shows you your email, let’s you Facebook or tweet your friends where ever you might be and what ever you might be doing. You can even use it to phone people!

Arguably we fritter away most of the enormous amount of processing power and storage that our hand held devices provide. We watch videos on them, yes, even porn, and play endless silly games on them. And cats. Cats have taken over the Internet and thereby our connected devices.

A six-week old kitten.

A six-week old kitten. (Photo credit: Wikipedia)

The fundamental concept of the mainframe is one single powerful(!) computer with all devices, such as card readers, terminals (screen and keyboard, no mouse), printers, tape units and other devices, more or less directly and permanently connected to the computer.

Interestingly, when you typed something into a terminal using the keyboard, it wasn’t sent immediately to the mainframe but was recorded in a buffer in the terminal. When one of a number of keys was hit the whole buffer was sent to the mainframe. These special keys were “Return”, which is similar to the “Enter” key, a “PF Key”, which is similar to a function key, and a few others.

Return

Return (Photo credit: Wikipedia)

This meant that you could type and edit stuff at your terminal and it would only be sent when you were finished. That is different from the model used by PCs and other modern devices, where every single key press that occurs is sent to the target computer, including typos and correction to typos.

Of course, when you press a key on your PC keyboard, the computer that is the target is the one that the keyboard is connected to, and what you type in goes into a buffer, but the principle still applies. The effect is more obvious if a lot of people are connected to a multi-user computer and are using it heavily, when the response to hitting a key takes a second or so to echo back to the screen.

Multi-user computers are not common these days as they are not trivial to set up, and computers and networks have become so fast that it is generally easier to change the model and access applications over the network rather than use the direct connect model that was used in the early days.

A lot of the features of modern computing devices originated in mainframes. Mainframes originally ran one job or task at a time, but soon they became powerful enough to run many jobs at the same time. Mainframe operating systems were soon written to take advantage of this ability, but to achieve the ability to run multiple jobs, the operating systems had to be able to “park” a running job while another job got a slice of the processor.

Punched card in the 80-column-format according...

Punched card in the 80-column-format according to the IBM standard. The card was used at the beginning of the 1970s at the University of Stuttgart (Germany) for the input of Fortran programms in the IBM mainframe. The plain text of the coded line is on the top left. (Photo credit: Wikipedia)

To do that the operating system had to save the state of the process, especially the memory usage. This was cleverly achieved by virtualising memory usage – the job or task would think that it was accessing this bit of memory but the memory manager would make it use that bit of memory instead. The job or task didn’t know.

For instance the job or task might try to read memory location #ff00b0d0 (don’t worry about what this means) and the memory manager would serve up #ffccbod0 instead. Then a moment of so later another job or task might try to read that memory location. It would expect to find its own data there not the first task’s data, and the memory manager would this time serve up, say, #ffbbb0d0.

SVG Graph Illustrating Amdahl's Law

SVG Graph Illustrating Amdahl’s Law (Photo credit: Wikipedia)

The key point is that the two tasks or jobs access the same address, but the address is not real, it is what is known as a virtual address, and the memory manager directs the request to different real addresses. This allows all sorts of cunning wheezes – a job or task can address more memory than the machine has installed and memory locations that have not been used in a while can be copied out to disk storage allowing the tasks in the machine to collectively use more memory than physically exists!

Exactly the same thing happens in your phone, your tablet, or your PC. Many tasks are running at the same time, using memory and processors as if these resources were dedicated to all the tasks. (Actually not all tasks are running at the same time – only as many tasks as there are processors in the processor chip can be running at the same time, but the processors are switched between task so fast it appears as if they are. The same is also true of mainframes).

Diagram showing the memory hierarchy of a mode...

Diagram showing the memory hierarchy of a modern computer architecture (Photo credit: Wikipedia)

Of course, there’s a downside to the mainframe model and that is that if the mainframe goes down, everyone is affected. In the early days of the PC era, every PC was independent and if it went down (which they often did) only one or two people, those who actually used the computer were directly affected. So if the Payroll computer crashed it didn’t affect Human Resources.

Soon though the ability to connect all the computers over a network became possible and computing once again became centralised. Things have changed, but the corporate server or servers now fulfil the role that once belonged to the mainframe.

All the advantages of centralisation have been realised again. Technical facets of the operation of computers have been removed from those whose job was not primarily computing, much to the relief of most them I’d suspect. Backups and technical updates are performed by those whose expertise is in those fields, rather than by reluctant amateurs in the field.

However, the downside is that a centralised computing facility is never as flexible as the end users would like it to be and, somewhat ironically, that as an outage of the old mainframe used to affect many people, so will an outage of a server or servers in the current milieu.

Ganglia report showing editing outage, when Wi...

Ganglia report showing editing outage, when Wikipedia server srv156 stopped responding (Photo credit: Wikipedia)

 

Posted in Computing, General, Internet, Miscellaneous, Society | Tagged , , , , , , , , , | Leave a comment

Too Much Sweetness

English: Macro photograph of a pile of sugar (...

English: Macro photograph of a pile of sugar (saccharose) (Photo credit: Wikipedia)

Sugar is a the name given by chemists to a family of compounds comprised of Carbon, Hydrogen and Oxygen in various configurations. Generally there are the same number of Carbon and Oxygen atoms and twice as many Hydrogen atoms, but this is not always true.

So far as I know all living things contain sugars, which supply the body with energy through a complex series of chemical reactions which function to slow down the release of energy from the sugar, which would otherwise be released in an unusable burst of energy.

English: Basic overview of energy and human li...

English: Basic overview of energy and human life (See also Wikipedia:Energy#Energy_and_life). (Photo credit: Wikipedia)

The end result of these reactions is the release of water and carbon dioxide. The cycle of reactions needs as many Oxygen molecules as there are sugar molecules, more or less, assuming the the sugar is fully broken down, and that is why all living things need to take in Oxygen and why we breath out carbon dioxide.

We don’t normally notice the sugar that we take into our bodies as it is largely contained in the foods that we eat. With the exception of the sugar in our tea and that we may scatter on our cereals, it is invisible to us. We actually take in a lot of sugar when we eat things.

WLA vanda English Tea Set 18th century

WLA vanda English Tea Set 18th century (Photo credit: Wikipedia)

In fact we are told that we take in far too much sugar in a modern diet. People drink tea and coffee with sugar, or drink copious amounts of sugar filled soft drinks and we know that this is bad for us. It rots our teeth and makes us fat. It predisposes us to diabetes and other metabolic problems.

The reason that it makes us fat is because early humans (and other animals) had a life which saw feasts and famines as the food supply fluctuated. The body evolved to take advantage of the feast phases by storing energy for the famine times by converting the excess sugars that were ingested to fat. Fat is harder to break down to release its stored energy, and the body preferentially uses any sugars circulating in the body (in the form of glucose).

The aldehyde form of glucose

The aldehyde form of glucose (Photo credit: Wikipedia)

As a species we have a taste for sugar. The body wants to take in as much as it can, in order to keep itself running, and to store up energy as fat for the lean times. However, these days, there are rarely any truly lean times for most people, so they take in more sugars than they need and store it as fat.

There is debate sometimes as to whether or not our desire for sugar amounts to an addition. Personally I don’t feel that it is truly an addiction, just a very strong desire to eat as much sugar containing food as possible. People don’t suffer intense reaction to the withdrawal of sugar from their diet as they would if it were an addition.

Chocolate cake with white chocolate squiggles.

Chocolate cake with white chocolate squiggles. (Photo credit: Wikipedia)

Generally they don’t suffer hallucinations, pains, or other mental or physical symptoms. Quite often they even feel better. Quite often they lose weight. Diabetes symptoms may abate, they may sleep better, and other physical problems may disappear.

It seems a no brainer that we should reduce the amount of sugar that we consume in our food and drink, yet we continue to consume it to excess. In my opinion there are at least three reasons for this.

Soft drinks 800x600

Soft drinks 800×600 (Photo credit: Wikipedia)

Firstly, the body itself makes us crave sugary foods, as it has evolved to make us feel pleasure when eating something that it can use for fuel and additionally store up for the leaner times that never come. We are predisposed to like sweet things, and our experience tells us that a chocolate bar is sweet.

Secondly, we have been given sweet things as a treat from the time that we are small, and we expect our treats to be sweet. In a restaurant the main course is about protein, usually with some meat or other as the star, but desserts are treats and therefore must be loaded with sugar.

Portuguese cuisine - Azorean sweet desserts

Portuguese cuisine – Azorean sweet desserts (Photo credit: Wikipedia)

Thirdly, it is absurdly easy to obtain sugar these days. The confectionery aisle of the supermarket has the most shelf space. Cakes and desserts take up shelves of their own, as do soft drinks which are laced with sugar.

That’s a big issue. Everything has sugar in it these days. In the past there was sugar in many things, but I believe that the quantity of sugar was lower. These days there is a large slug of sugar in almost everything.

It’s even crept into the main course. Glazes and marinades have always had sugar in them as the sugar caramelises on the meat as it cooks, and gives it a nice colour, but many pouring sauces and dressings also contain copious amounts of sugar. Even the humble meat pie contains sugar or so I heard. Something to do with giving the right consistency to the gravy, I believe. So what was wrong with the original ways of thickening it?

This has all led to an issue, so far as I am concerned. I can see all the health benefits of reducing one’s intake of sugar, but so far as others are concerned their bodies are their own responsibility. If they wish to make themselves fat and ill, that is up to them.

English: This is a graph showing the rate of o...

English: This is a graph showing the rate of obesity in adults and the rate of being overweight in both children and adults in the United States from 1960 – 2004. (Photo credit: Wikipedia)

What really annoys me about the sugar in everything trend is that almost everything tastes of sugar! I gave up sugar in tea many decades ago, and I didn’t miss it, but now I hate the taste of tea with sugar in it. I can’t drink it. I also gave up sugar on my morning cereal, which was harder, but I now don’t miss it. There’s already some sugar in it of course so why add more?

But everything else? Everything that you touch at the supermarket is laced with sugar, from the white stuff they call bread to the pickles and sauces you put in your sandwich. As a result, you can’t taste much of anything under the overpowering sweet taste.

A plate of fairy bread, cut into triangles.

A plate of fairy bread, cut into triangles. (Photo credit: Wikipedia)

Someone once commented when I complained about the overbearing sweet taste of everything, that I could just make my own. That’s fine, and I do do it as much as I can, but it’s not always possible, as the ingredients may already contain sugar, and sometimes i just wants the convenience of picking something off the shelf.

English: Organically produced blackstrap molas...

English: Organically produced blackstrap molasses produced in Paraguay. (Photo credit: Wikipedia)

Posted in Cooking, General, Miscellaneous, Politics, Science, Society | Tagged , , , , , , , , , | Leave a comment

Thus it was written….

1976 The beginning of flexible computing in pu...

1976 The beginning of flexible computing in public health. Auditorium A at CDC, converted to a war room for the Swine Flu crisis, is filled with epidemiologists and a Digital Equipment PDP 11 minicomputer the size of a refrigerator. A program called SOCRATES, written in FORTRAN by programmer Rick Curtis, allowed an epidemiologist to define questions, enter data, and summarize the results in tabular form without the aid of a programmer. (Photo credit: Wikipedia)

Have you ever noticed that a computer program never does exactly what you want? Oh, it will process your data for you, and produce results that you can use, or it will move those files from here to here, but may move ones that you didn’t want moving or leave ones that you did want to move. But it won’t do exactly what you want, first time with no hassles.

Of course you can make it work for you, make it do what you want more accurately, but you have to work harder to make it do so, and programs are supposed to make things easier, right? Take this very editor that I am using to compose this post. I thought the bold words above as I wrote, but I needed to perform an action to make them come out bold and another to ensure that the text after the bold words didn’t also come out bold.

JWPce is a Japanese Word Processor, this softw...

JWPce is a Japanese Word Processor, this software is under GNU license. (Photo credit: Wikipedia)

Of course this is a very minor consideration and if I were to find a program that changed the font to bold for one word and then stopped, I’d probably find it irksome to bold two words in succession. Also, I’d bet the house that there would be something that the first program did automatically or easily that would be difficult to achieve using the second program.

Those who are not programmers seem to have an ambivalent attitude to programs. On the one hand, if they are using a program and they can’t get it to work, they blame themselves. “I must be doing something wrong!” comes the impassioned plea. So the technophile in the household has to interpret what helpful statement “It doesn’t work!” really means and what how the program expects in the way of input. Problem fixed. Until the next time.

Broken mirror

Broken mirror (Photo credit: Wikipedia)

On the other hand, the non-programmer will accept it without question when the hero/heroine of the film briefly types something at the computer and the world is saved! Hooray! The sentient virus destroying humanity is defeated! Hooray again!

However these issues with programs are not bugs. The program is not doing something wrong. The issue is with our expectations of how things ought to work. It may well be that the program is designed to do things differently to those expectations, either because the programmer assumes that the way that he codes it is the way that people will expect things to work.

If the programmer gets a lot of issues with a particular feature of his program, he may decide to change it to fit more closely with the expectations of the users, and then send out an update. It is likely that he will then get a lot of issues from those people who have been using the program for a while and have come to expect it to behave the old way. The programmer can never win.

I’ve done quite a bit of programming over the years, thankfully mostly for myself. Every program that is written these days usually fits into what might be called an ecosystem. There are programs to gather data, programs to crunch data, and programs to display the results, but there are many programs to perform each of these three tasks.

English: 2008 Computex: A panel of embedded sy...

English: 2008 Computex: A panel of embedded system by DM&P. (Photo credit: Wikipedia)

For example, the results may be printed on a printer, either as a table of data, or as graph or pie chart, or in these days of 3-D printing, a physical object, or it may be displayed on a screen, or in any other way where the recipient can interrelate with it.

Data input may typed in, drawn in on a graphical input device, or it may be collected by some means or other from sensors or other devices. Your heartbeat may be collected from a number of sensors on your skin, read by a machine and be printed off on a roll or paper, while at the same time being displayed on a local screen. It may also be sent off to some remote location where specialists may peruse it.

Fetal heart beat 200 bpm. Ultrasound scan. Pro...

Fetal heart beat 200 bpm. Ultrasound scan. Provided as-is. Please feel free to categorize, add description, crop or rename. (Photo credit: Wikipedia)

In the middle, between input and output comes the processing or crunching of the data. This is what most people think of when they think of computer processing. Somewhat unfairly the input and output processes are relegated to only secondary interest. This is, however, what a program or system is written to do. Even so, input and output processes may be complex.

Data may be processed in several different ways in between input and output, and by several different programs. There are layers within layers. For example a program that takes advantage of a database uses many layers. The program which the programmer is writing will no doubt call programs (called APIs or interfaces) within the environment that he is working in which start the process of communicating with the database.

Read-copy-update

Read-copy-update (Photo credit: Wikipedia)

The API puts the programmers request into a form that the database expects and sends it to another process, not usually part of the programmer’s chosen system, which exists only to connect the programmer’s program (and any other similar programs) to the database.

At the database end the receiving part of the database system receives the request and passes it to the main database program, which checks it and executes it. During the execution process the database program makes calls to system programs which perform any necessary retrieval or writing of the data to the system’s file system, via the system’s hardware interface with the storage system.

I’ve collapsed many layers in the explanation above. The main point is that the programmer’s program is the tip of the iceberg, and there are many layers which are called into action during the execution of the program. To complicate things further, the system that the programmer uses to perform his work is also a program and has its own layers on top of layers.

This explains why programs don’t ever do exactly what you want. The programmer has to use utility programs which, while flexible can’t do everything. The utility programs are also flexible, but are interfacing with other programs, which while flexible also can’t do everything. And so on.

English: TM-database

English: TM-database (Photo credit: Wikipedia)

The more flexible a program is, the bigger it is, as it has be programmed to enable the flexibility. So, this forces constraints on it, which impose constraints on the programmer, whose program therefore imposes constraints on the user of the program. And those constraints are why the program can’t do exactly what you want, but usually, it’s close enough that the program is useful to the end user. Most of the time.

Angry Penguin

Angry Penguin (Photo credit: Wikipedia)

Posted in Blogging, Computing, General, Miscellaneous, Philosophy, Society | Tagged , , , , , , , , , | Leave a comment

Water, the cause of surfing.

English: Environmental Science student samplin...

English: Environmental Science student sampling water from a stream. Picture courtesy of Environmental Science program at Iowa State University. (www.ensci.iastate.edu) (Photo credit: Wikipedia)

I came across one of those pages on the Internet which state something like “At least a few molecules of the water in your body probably passed through the kidneys of Julius Caesar“. They generally use statistics to show that what they are saying is true.

Only those who believe in homeopathy should be disturbed by this. To anyone else, a molecule of water is a molecule of water, and the fact that it had once been contained in a stream of urine is irrelevant. In any case it is too late. 60% of our body is made up of water, so water from Caesar’s urine is already in us.

Julius Caesar, Summer garden, Saint-Petersburg

Julius Caesar, Summer garden, Saint-Petersburg (Photo credit: Wikipedia)

Water is a fascinating chemical. It carries stuff around as it is the basis for blood and lymph and all the other fluids of our bodies. It carries nutrients up the stems of plants. It wears away mountains and builds rocks, it cools lava to form other rocks. It brings nutrients to our crops and washes them away. It even sinks ships.

“You are water
I’m water
we’re all water in different containers
that’s why it’s so easy to meet
someday we’ll evaporate together.”
― Yoko Ono

It’s difficult to think of any occurrence in our familiar world which is not mediated or affected by water in some way. Shortage of water to a society is a disaster, as food cannot be produced, leading to famine and deaths.

Much of the western U.S. is in "extreme d...

Much of the western U.S. is in “extreme drought” (Photo credit: Wikipedia)

Water is thought by most people to be liquid at usual temperatures, though there are some places where it is to be found in solid form. Actually there is a great deal of it around in the gaseous phase, or vapour. We measure this airborne water in terms of the humidity or wetness of the air.

Water is extraordinarily pervasive and can be found in all the nooks and crannies in the materials that we have around us. It acts as a lubricate, and if the water is driven off, by heating or chemical means things become stiff and fragile. Even so, water cannot be completely removed from things – even a diamond probably has a few entrapped water molecules.

Water molecules attaching to each other by hyd...

Water molecules attaching to each other by hydrogen bonds (Photo credit: Wikipedia)

Water plays a role in rotting things down. A corpse kept in a very dry environment desiccates and turns leathery and fragile. I guess that this is because the organisms that rot a body away cannot function in a water free environment.

A body of liquid water fills things from the bottom up. Gravity pulls the water down to the lowest parts of a container and water continues to layer the container. The surface appears to be flat, but that is an illusion. At a small scale, if a tiny bit of the water happens to be higher than the rest of the water, gravity will pull it down, while the other water molecules resist by being in the way.

English: Dilmah - photo by me on today.

English: Dilmah – photo by me on today. (Photo credit: Wikipedia)

Eventually as the water stills, the differences in level even out, and the water surface becomes as level as it can. However, at the molecular level, molecules of water, which are moving relatively fast on these scales, can pop out of the liquid and float away. Other molecules can also pop in to the liquid, so that on average the water is level.

Why doesn’t the surface appear blurry and ill defined then? Well we can’t see at the molecular scale, and also the water molecules form weak electrical bonds with each other. A water droplet is like a large crowd of people all milling about, holding hands much of the time. Those on the outside are not as tightly bound as those further in.

Imagine now that the crowd is surrounded by a storm of people who are moving faster, and are more spread out so they rarely join hands. One of these gaseous people will now and then bump into the crowd. They may knock loose one of the crowd who will shoot off and become one of the gaseous people, while gaseous person who hit him may now be travelling more slowly and link up with the crowd.

Even in the macro world a water surface is rarely really flat. The dynamic nature of the flatness is apparent when a container is jolted slightly and tiny waves form on the surface as compression waves disturb it. Wind and rain also cause visible disturbances in a lake or pond.

Surface waves

Surface waves (Photo credit: Wikipedia)

Flowing water often forms a smooth, if not level surface. A submerged rock in a river or a weir or fall in a river can form persistent ripples of flumes as the water flows over them. Kayakers know to aim their craft at a flume to safely descend a rapid or waterfall, although downstream of flumes the river often forms “haystacks” where turbulent water is forced into humps which can prove difficult to navigate.

A little stream may be described as turbulent as it makes its way over and around boulders and small drops, but interestingly it is not random. It is not chaotic. A close look will reveal that the bow waves of stones in the flow may flutter and throw off little whirling vortexes, but the bow wave and the pattern of vortexes persists. The little waterfall over a small stone ledge persists, even though the shape of the waterfall may ripple a little.

Ripple effect on water.

Ripple effect on water. (Photo credit: Wikipedia)

In large bodies of water, such as lakes and seas, winds form waves which can travel many thousands of kilometres across oceans and seas. Water waves don’t represent the movement of water over those distances – the only thing that moves is the energy in the wave. Water molecules in a wave move mainly up and down and only a little forwards and backwards.

Circular water current in a wave

Circular water current in a wave (Photo credit: Wikipedia)

However when a wave travels over a beach or shoal, the movement in the vertical direction is curtailed, and the energy is transformed into a forward motion – the wave breaks. Water is transported forward, with the water higher up moving faster than the water at the sea bed which may be water draining off the beach from the previous wave and the wave steepens until it collapses. Hence surfing!

 

Posted in General, Miscellaneous, Philosophy, Science, Society, Weather | Tagged , , , , , , , , , | Leave a comment

Real or virtual caving? What’s the difference?

Grjótagjá caves near Mývatn lake, Iceland. Fra...

Grjótagjá caves near Mývatn lake, Iceland. Français : Grotte et source de Grjótagjá près du lac Mývatn, en Islande. (Photo credit: Wikipedia)

A bit less than a year ago I posted about caves virtual and real. I’m going to expand a bit on this today.

I worked for many years as a Linux Systems Administrator, a job which I loved and to a large extent brought home with me. I run a number of Linux systems at home, including the computer that I am writing this on. I have a system that I refer to as my “server” which I use for backups and for things that might get in the way on my desk computer.

Tux, the Linux penguin

Tux, the Linux penguin (Photo credit: Wikipedia)

When Minecraft was a craze some time ago I didn’t get involved at first but when my grandkids got into it I became interested. In Minecraft you can build elaborate structures, but to do so you need to find and extract the necessary materials, and, depending on the server that you are using, fight off automatic monsters (“mobs”) and other players.

I installed the Minecraft client, tried it out and liked what I saw. However, playing on other peoples’ servers soon became less than satisfactory. I didn’t like the unrealistic ability to “fly” (not fall down when unsupported by things) and the combative aspects of the game were found on many servers.

So, I investigated and tried running my own Minecraft server. This is possible, and not particularly tricky, you still have to pay for the client. There’s nothing wrong with paying for things, of course, and I did pay for it, but being a Linux user I’m always interested in seeing if there is a free version out there. Not of the actual Minecraft naturally, but of a similar program.

Minetest is a very similar program to Minecraft, works in much the same way, but is free, and there were Linux packages available, meaning that the install was simple. So I installed the packages and started playing. (I later downloaded the source code and compiled it, but that is another story. The packages worked fine).

Install debian

Install debian (Photo credit: Wikipedia)

Pretty much everything that you can do in Minecraft you can also do in Minetest. The differences are minor. So everything I say from here on will probably apply to either program.

The game is all about assembling resources to build things, and you assemble resources mainly by mining. You whack a block (say stone) with a tool (say a steel pickaxe) and it disappears and appears in your inventory. When you have enough blocks you can build a wall of them by taking them from your inventory and placing them appropriately. That is the start of your fortress or palace.

English: Old house with flint front wall, John...

English: Old house with flint front wall, Johnson Street, Ludham This house on the A1062 has a beautiful front wall made of squared-off blocks of flint. (Photo credit: Wikipedia)

A plain stone building is boring, so you will want to acquire some fancy blocks to smarten it up and that is where the game shines. You can make fancy blocks to place on your building, but to do that you need to acquire resources and fabricate or “craft” them. The resources are found under the ground, which requires you to dig down to get them, which is of course where the “Mine” part of the name comes from.

If you dig downwards (on a slope, so that you can return to the surface eventually) you will sooner or later encounter a void or space where there are no blocks. Hopefully you will avoid falling to the bottom and dying. If you carefully climb down to the bottom of the void you are are the bottom of a virtual cave.

The Cave Automatic Virtual Environment at EVL,...

The Cave Automatic Virtual Environment at EVL, University of Illinois at Chicago. (Photo credit: Wikipedia)

The cave may have blocks which look slightly different to the normal blocks. These blocks contain resources, usually ores, that can be collected and used to make other special blocks. For instance a block with iron ores in it can be used to make steel ingots, which can then be used to make steel pickaxes and other useful tools.

The game’s caves are similar in many ways to real caves. The topography of the caves is varied, with narrow passageways in some places, deep clefts in others, potholes, and sometimes openings to the surface.

English: Middle Washfold There are several cav...

English: Middle Washfold There are several caves and pothole entrances near here. The top layer of limestone pavement seems separate from the rock beneath which has eroded in a different way. (Photo credit: Wikipedia)

Of course it is dark underground. That means that you need to manufacture torches and carry them in your inventory if venturing underground. A torch placed on the wall will illuminate a small area of the cavern leaving dark voids beyond the torchlight which might be interesting to explore!

The game’s caves often have, just like real caves, uneven floors and there will be much jumping over obstacles, and climbing up and down. Some caves do have flatter floors, as do many real caves.

English: Subglacial pothole on Pothole Dome.

English: Subglacial pothole on Pothole Dome. (Photo credit: Wikipedia)

Some game caves have sloping floor, much like a staircase, and the roof also may slope down, giving the impression of a sloping slit, as is often found in real caves. It is not advisable to skip down the slope into the darkness, of course, as the slope may end in a drop, as may also be found in a real cave.

Game caves are often elongated, just like real caves, and may form large interlinked caverns. Cross passages may start way up on the walls of the caverns, just as happens in real caves. It’s often possible to travel some distance more or less horizontally before one has to climb up or down to continue.

Game caves do not often contain water, which is unlike most real caves, and when they do the water is either in the form of a waterfall or a lake. Long flowing river of water are not common in game caves. Sometimes a cave will contain a lake of lava, or a lava fall which often looks spectacular. Both lava and water may form short flows but will quickly “seep” into the rocks.

Some of the potholes are spectacular. As they are underground and dark, one cannot see the bottom. Often they can edged or mined around and descended that way. Looking back up one can see the torches that one placed on the way down as tiny lights, often to spectacular effect.

An abandoned mine near Yerington, Nevada, Unit...

An abandoned mine near Yerington, Nevada, United States (Photo credit: Wikipedia)

I’ve explored both real caves and game caves, there is a great deal of similarity in the experience. In both cases, one has only limited visibility around one, one has a sense of void, and a sense that one may fall. There’s the thrill of discovery as one explores, and a sense of achievement. Unfortunately in the game caves, there are no stalactites and stalagmites to decorate the cave, but perhaps someone will write some in some time.

Entrance to the REACTOR, at the , a cultural /...

Entrance to the REACTOR, at the , a cultural / history museum in Athens. The REACTOR is a CAVE virtual reality system sold by Trimension. (Photo credit: Wikipedia)

 

 

 

Posted in Computing, General, Internet, Miscellaneous, Society | Tagged , , , , , , , , , | Leave a comment

About Mums, and a little about Dads too.

Mother hen with chicks02

Mother hen with chicks02 (Photo credit: Wikipedia)

I wrote about cuteness a couple of posts ago, and this started me thinking about mothers, both human and animals and how the bonds that they form with their offspring.

Many animals do not look after their offspring, just casting their fertilised eggs into the seas like many fish or placing their eggs on a food plant as butterflies and moths mostly do. However, many animals do look after their eggs and young offspring, often for extended periods of time.

Danaus Plexippus, Monarch Butterly, picture ta...

Danaus Plexippus, Monarch Butterly, picture taken in NewYork, October 2008 (Photo credit: Wikipedia)

It is common for the mother of an animal to look after it rather than the father, but it is not uncommon for the father to look after the offspring, and more commonly both parents will look after their progeny.

For example, the egg laid by most species of Kiwi is incubated by the male member of a pair of birds. Also, in the Seahorse, the female deposits her eggs inside the male’s “brood pouch” and the young of the Seahorse develop there.

Once young animals are born, often the female parent will take care of them for some time after they are born, but this is not a definite rule. Sometimes the male parent is around and provides some support and protection, and even if the male parent is around, he may remain fairly distant, with the female doing most of the caring for the young animals.

A common sight is a mother hen closely followed by her chicks, with the aloof cockerel strutting around the farmyard. In a pride of lions, the nucleus of the pride consists of the females and offspring while the associated males remain close.

English: Four Lionesses take down a bull cape ...

English: Four Lionesses take down a bull cape buffalo in the central Serengeti (Photo credit: Wikipedia)

In humans, the so called “nuclear family” is common, at least in Western cultures. A nuclear family usually consists of a couple and their children living in a single house, and is a relatively recent phenomenon, with extended families being common in many cultures, including Western cultures, until fairly recently.

In such a nuclear family, the father goes out to earn money for the family every day, leaving the children in the care of the mother for the day. Such role separation and assignment could be seen as “natural” and “obvious”. This can be problematic when the couple are not male and female, when role assignment is trickier.

Guarani nuclear family of Mato Grosso do Sul, ...

Guarani nuclear family of Mato Grosso do Sul, Brasil (Photo credit: Wikipedia)

It is likely that there is an instinctive drive for a mother to care for her children and for the father to be assigned the role of provider for the family. Certainly this tendency for children to be cared for by the mother and for the father to fill another role can be seen in most societies, even those without the concept of the nuclear family.

In a family consisting of a couple of same sex parents, this role division is not well defined and indeed such couples may decide to share both provider and carer roles within the family group, which could speculatively lead to kids who are unclear about the distinction between the carer and provider roles.

Kids are resilient though, and being more willing to share the roles when they grow up and form their own, probably heterosexual, relationships and families may even be an advantage. That’s not to say that the father in a heterosexual couple whose parents are also a heterosexual couple are not capable of caring! The roles in Western societies are not so strictly defined that a father cannot be a carer for some of the time, and that a mother cannot be a provider.

Regardless of such quibbles, mothers tend to be more caring and nurturing than fathers in Western societies. Both boys and girls tend to go first to Mum when a knee is scraped or an elbow bashed, and they go to Dad for the resolution of disputes, such as when a sibling has stolen a favourite toy and won’t return it.

This is probably because the mother has more invested in the children than the father. She has carried the child for nine months, culminating in a painful delivery, while the father has watched on and the only pain that he has suffered was when his spouse squeezed his hand too hard during a contraction and left nail marks in it. Of course, I am drastically under valuing the support that the mother has received from her spouse.

Mother have a close bond with their children, and we can see it in modern society, where a couple is not always “till death do us part”. When a couple splits the children more often seem to go with the mother, although there are blended families where some of the kids are the father’s and some are the mother’s.

Mothers can be particularly close to their daughters, but they are even close to their sons. No other person has changed your nappy (diaper), clothed you, nursed you through minor ailments, and fed you from the moment of birth until you leave home. Step daughters and sons can sometimes have difficulty getting as close to step mothers, and this can cause issues.

Poor old Dad. He gets the affection, the love, but usually not to the same depth as the children love their mother. Actually, I think that the bonds that form between a man and his kids are just as deep as mother love, but they are manifested in different ways. Dad is the one that the kids look to for protection much of the time, Dads tend to be the ones who encourage the kids to stand on their own feet.

The difference is that Dads are in general more able to form relationships at a distance. He may mainly see his kids in the evenings and at weekend. Modern life has pretty much forced a hands off approach to parenting for Dads. When a split up comes it is frequently easier for a father to move away from his children, painful though it may be than for a mother to move away from them.

Breaking up a family is always difficult, but with nuclear families it is more difficult. In an extended family there are always granddads. grandmas, cousins and aunties and uncles to take up the slack. The modern child doesn’t have quite so much support. It’s a wonder that, in general, they still turn out OK.

English: This is the photograph of an extended...

English: This is the photograph of an extended family belonging to the Pais-Prabhu, a Mangalorean Catholic clan hailing from Falnir in Mangalore. (Photo credit: Wikipedia)

Posted in General, Miscellaneous, Philosophy, Society | Tagged , , , , , , , , , | Leave a comment