Posted in Science & Nature

How To Make Fire

Fire has been the single most useful tool in the history of mankind – something that truly separates us from other animals. Yet, when stranded in the wild, most people are incapable of making fire as the comfort of technology has robbed us of the skill.

Obviously the easiest method is a lighter or matches. 
The next easiest method is striking a flint with a knife, piece of steel or another flint. However, flints are not easy to recognise in nature unless you have experience. The following methods use minimum equipments that can often be found in the wild.
Note that you must have dry tinder to catch the spark and kindling to start the fire. Tinder is any easily combustible material that is light and fluffy, so that it quickly burns up after catching the spark.

There are two main methods: sunlight and friction.

Sunlight can be focused to create a spot of intense heat. This is a phenomenon even children use to burn things (such as insects). Instead of a magnifying glass, you can disassemble a camera to take the lens out, or use a plastic bag filled with water to make a crude convex lens.

The other method involves rubbing two pieces of wood rapidly. There are many ways to do this, with some methods being easier and faster.
The most crude method is the hand drill, often the first thing people associate to firemaking. This is when you simply rub a wooden stick in a notch in a fire board (larger piece of wood). Do this by spinning the shaft between your two palms in a fast motion. The tinder is put where it is being rubbed so that it starts burning when enough heat builds.
This is actually surprisingly tiring and hard to make fire with, so an improved method called the bow drill is used more often. This uses the same methods, but instead of your hands, you make a bow and wrap the bowstring around the shaft. This lets you spin the shaft with long forward-and-backward motions, lessening the burden. Putting a piece of wood or rock on top of the stick also prevents hurting the supporting hand.

Lastly, the fire plough method can be used. Here a groove is cut into a fire board, and a long stick is rubbed along it in a ploughing motion. The hot charcoal made is transferred to the tinder.

Once the tinder is smouldering, blow into it or swing the tinder to aerate it, fuelling the fire. This will cause the tinder to light up, which can be put in the kindling to start a fire. Slowly feed the fire with firewood (too much and you will smother it) while giving it plenty of air.
Now, you have warmth, light and hot food.

Posted in Science & Nature

Shrew

A shrew is a small rodent, similar in size to a rat, that has many fascinating characteristics.

Funnily enough, this animal has a notorious name in history. Ancient Egyptians considered shrews the spirits of darkness and the English believed that if a shrew ran over a lying animal, the animal would suffer great pain. The name shrew comes from the Middle Age English word shrewe, which meant “evil” or “scolding person”.
This is probably attributable to the putrid smell a shrew makes when threatened, and its poisonous bite.

Despite its tiny figure, the shrew has the greatest surface-area-to-weight ratio out of any mammal on the face of the Earth. Because of this, they also have a high heat expenditure, meaning they have to eat constantly to replenish the energy. This means that they sometimes die from starvation during prolonged naps.
Also, they have an extremely high heart rate, averaging about 700 beats per minute. When they are frightened, the heart rate can spike leading to cardiac arrest. For example, shrews are known to die from being frightened by the sound of thunder.

An animal that dies if it naps too much or when thunder strikes – the shrew is a very sad animal.

Posted in Science & Nature

Man Versus Ant

Human:
A mammal that ranges in size from about 1 to 2 metres.
Weighs between 30kg and 100kg. Females are pregnant for 9 months. 
Omnivorous diet. Population estimated around 7 billion.

Ant:
An insect that ranges in size from about 0.01 to 3 centimetres.
Weighs between 0.001mg and 1g. Can produce eggs endlessly given there is an ample sperm reservoir.
Omnivorous diet. Population estimated around 1 quintillion (1 billion times 1 billion).

(from The Encyclopaedia of Relative and Absolute Knowledge by Bernard Werber)

Posted in Science & Nature

Bat

The most famous characteristics of a bat is its behaviour of hanging upside down. This strange behaviour actually greatly benefits a bat’s survival.  Because a bat’s wing is structurally different to a bird’s, it cannot generate enough flight to lift a bat off the ground directly. Therefore, bats leap off a high location to fly, so hanging from a high place allows them to fly off at any given moment. Also, living in a high place provides protection from predators.

A bat’s anatomy has heavily adapted to accommodate this behaviour. Thanks to its unique anatomical structure, a bat expends no energy while hanging. This is because they have talons that are designed to clench naturally when pulled by gravity, as the tendons tense. Thus, when hanging upside down, a bat can rest peacefully, and can even sleep in that posture as it requires no muscle action (all muscles relax in REM sleep).

As it is the norm to live upside down, a bat does everything in that manner. As stated above, a bat sleeps upside down, eats upside down, mate upside down, and even stay like that after death. There is only one time a bat stands upright: when it excretes waste. Even behaviour cannot overcome the power of gravity.

Posted in Science & Nature

Urban Paradox

A few years ago, a theoretical physicist studied population growth in cities to find the mechanism of how cities operate. What he found was an astonishing law.
Wherever the city, as the population doubled in size, the average income, number of patents, number of educational and research facilities and other important numbers all increased around 15 percent. Although it is normal for such statistics to increase as a city grows, it is interesting to see that almost all of them increasing at a similar rate, despite being so different sometimes.
More fascinating is the fact that not only do the above “good” statistics increase equally, but so do crime rates, pollution, smog occurrence, stomach flu and AIDS prevalence all increase approximately 15 percent.
Therefore, a city can be seen as a double-edge sword that is both the source of fast growth, wealth and ideas, but also waste, pollution, stress and disease.

Biologically speaking, an organism has a tendency to have slower growth and pace of life as it gets larger. For instance, an elephant’s heart beats slower than a mouse, and its cells do less work on average too. However, a city exhibits a snowball effect where it grows faster as it gets larger. To achieve this extremely high rate of growth, it must consume an immense amount of resources, which ultimately ends up as large quantities of waste and pollution. Also, as people get busier, the overall “quality” of the society falls, leading to increased stress and disease prevalence.

If so, should we abandon our current productivity and live a slow, village life and ignore our potential as a species? Or should we continue our exponential growth at the cost of using up nature’s well-maintained resources like no tomorrow?

Posted in Science & Nature

Bamboo

There is a bamboo forest on a desert island. How can you use these?

  • If you cut a section of bamboo so that one side is open, one side is closed, it becomes a cup.
  • If you cut a section of bamboo and split it lengthwise, it becomes a dish.
  • If you cut a section of bamboo and cut a wide hole in the side, it becomes a pot.
  • If you cut a section of bamboo and fit a large rock on one end, it becomes a hammer.
  • If you cut a branch of bamboo and craft it, it can be a spoon, fork or chopsticks.
  • If you take a stick of bamboo and tie a string and hook at the end, it becomes a fishing rod.
  • If you take a stick of bamboo and sharpen the end, it becomes a spear.
  • If you take many large bamboo and tie them together, you can make a house, a bed or a raft to escape in.

The most important rule of survival is application.

As an addendum, bamboo is a grass (the largest in the world), not a tree.
This is because its stalk has become hardened yet still hollow, making it look like a tree. However, it has segments, shallow roots and dies after flowering (which can take decades) that are features of grass.

Posted in History & Literature

Unicorn

The unicorn is pictured as a white stallion with a single, prominent horn on its forehead. It is still loved and is one of the most well-known mythical creatures. As with any mythical beasts, there are interesting stories related to the unicorn.

The horn is the source of the unicorn’s strength – the infinite fountain of magical power that grants the unicorn unmatched strength and speed. If it meets an enemy it either sprints and disappears, or uses its large weapon to impale even the hardest armour. This makes it extremely hard to capture.

Medieval people believed the horn of the unicorn to be a highly valuable magic ingredient, with extremely potent cleansing properties that could purify even lakes and seas. But as the only way to attain the horn is to capture a unicorn, it was an extremely rare commodity.
To catch a unicorn, one must know its most important (yet not well-known in the modern age) trait. Although they are wild beasts with a savage temper, they calm down like lamb in front of one group of people – virgin maidens. If it detects even the faintest scent of a virgin, it rushes towards her and places its head on her lap, soundly falling asleep. Due to this characteristic, it is often portrayed as a symbol of purity and chastity, and also Jesus Christ and the Virgin Mary.
According to notes written by Leonardo Da Vinci himself, hunters used this trick to capture unicorns that would fall asleep on a virgin’s lap (whom they brought with them to aide in the hunt). Even a mighty beast has a weakness that can be exploited.

On a side note, it is also written that if the unicorn senses that the maiden is not a virgin, it would instantly use its large weapon to impale her until death.

Posted in Science & Nature

Trophallaxis

One of the key characteristics of social animals is the act of helping other members of the society. People often think that nature is ruled by “the survival of the fittest” and selfishness for survival, but societies are common in the animal kingdom. For example, even insects, that people consider “inferior”, such as ants build massive empires and cities, forming an unbelievably intricate and efficient society.

In the wild, all animals must find food to live, but due to competition and the environmental conditions, there are days when an animal cannot find enough food. For times like this, ants have a second communal stomach which they fill with leftover food after a meal. They then approach a hungry colony member and offers it a meal. If the other ant accepts, the two ants then lock their mouths together and one ant brings up the food in the communal stomach into the other ant’s mouth. Benefaction such as this allows for a smooth functioning of the society.

There is another role of trophallaxis (the transfer of nutrients via the mouth-to-mouth route described above): communication. Ants rub their antennae together to identify each other’s pheromones, which acts as identification such as what colony they are from and their role in the colony. Some scholars suggest that trophallaxis is the origin of the kiss.

The act of offering pre-stored food to comrades is also found in vertebrates such as birds and bats. For instance, some species of birds feed, return to its nest and then vomits the food for the young to feed on.
Helping those in need to create an efficient and functional society, and reaping the rewards of quid pro quo: that is the way of the philosophy of 1 + 1 = 3.

Posted in Science & Nature

Fainting Goat

There is a very interesting breed of goats called the Fainting Goat. These goats suffer a genetic condition called myotonia congenita, which produces fascinating yet hilarious situations. When startled by the sudden presence of another animal or even a loud noise, these goats all suddenly freeze and fall to one side. This phenomenon can occur even while running, which causes the goats to crash into the ground, lying on their backs with their legs straight up. This can even occur from the excitement of seeing food and starting to run towards it.

The reason for this peculiar phenomenon is that myotonia congenita damages systems that allow muscles to relax, causing it to become easily excited. Ergo, when a goat is startled, its muscles tense reflexively, causing it to contract suddenly while taking longer to relax. This results in the goat becoming paralysed and falling. Young goats tend to be helpless when this occurs, but more experienced goats prop their legs apart quickly or lean against something to prevent falling (they can even be seen hopping on their stiff legs). These “fainting spells” are painless.

Although this kind of trait is often removed by natural selection (for example, in nature these goats would freeze when they meet a predator, and then proceed to be eaten), humans have bred these goats specifically to save their trait. In old times, these goats were used as “sacrifices” so that they would get eaten first when wolves struck, but nowadays they are bred in certain farms for no particular use. 
Myotonia congenita also affects other animals such as cats, and there are many people in the world affected by this condition too.

Posted in Science & Nature

Fibonacci Number

1 1 2 3 5 8 13 21 34 55…

A keen observer would note that each number in the above sequence is the sum of the two numbers before it. These are known as Fibonacci numbers and are among the most famous number sequences in mathematics.

It is famous because of some unique properties. For example, every third number is even, every xth number is the multiple of Fx (e.g. 4th number = 3, 8th number = 21…) and the list goes on. It is also known to approximate golden spirals, a mathematical function that is closely related with yet another famous number: the golden ratio.

However, a more interesting (and more relatable) fact about these numbers is that they appear repeatedly in nature. It has been noted for many centuries that plants tend to follow the Fibonacci sequence in various ways. This includes the number of branches of trees that grow per year, the number of petals on a flower (almost all flowers have a Fibonacci number of petals) and most interesting of all: the arrangement of florets on the face of a sunflower. If one carefully scrutinises the face of a sunflower (also applies to pine cones), they will note that the florets (tiny pieces on the face) are arranged in what appears to be spirals. They are actually arranged on a stack of spirals, both clockwise and anti-clockwise. The number of spirals for both directions are always two Fibonacci numbers next to each other (e.g. 34 and 55).

This is because natural selection pushes the plants to arrange their florets, petals and tree branches in the most efficient manner possible, which is provided by the Fibonacci sequence.

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