Posted in Psychology & Medicine

Sneeze

A sneeze is caused by the body trying to remove something that is irritating the nasal cavity. To do this, it contracts many respiratory muscles instantly to create a powerful expiration. This produces a gush of air and the foreign material at a speed of over 150km/h, which can spread saliva and mucus at a range of over 2m. Therefore, not putting your hand over your mouth during a sneeze is an easy way to spread infections like the common cold.

An interesting fact is that one cannot open their eyes during a sneeze. This is not because of the urban legend that the eyeballs pop out if the eyes are open when sneezing, but part of the reflex and powerful contraction of muscles. Also, pinching between the two nostrils very hard can stop a sneeze reflex successfully.
Lastly, although sneezing is usually due to breathing in an irritant, some people have what is known as a photic sneeze reflex (also called the ACHOO syndrome), wherein they sneeze when stare into bright light such as the sun.

Posted in Psychology & Medicine

Babinski Reflex

Normally when you tickle or stroke the sole of your feet, the toes flex inwards. However, when a newborn’s feet are tickled or stroked, the toes spread outwards. This is known as the Babinski reflex, or Babinski sign. It is a primitive reflex that disappears before 12 months of age.
If this reflex is seen after that, including adults, it is a sign there is something wrong with the nervous system, especially the brainstem or the spinal cord.

A primitive reflex is one shown by newborns but disappears gradually as they develop. These include reflexes such as the walking reflex, swimming reflex and crawling reflex that shows actions that they have not yet learnt, or the rooting reflex and sucking reflex that ensures the baby’s survival.

Posted in History & Literature

Cattle

Alison and John are standing in the same cattle field at the same time. John can see twice as many cows as bulls. However, Alison can see the same number of bulls and cows in the field. How can this be, and how many bulls and cows are there in the field?

Continue reading “Cattle”

Posted in Psychology & Medicine

Doppelganger

A doppelgänger is popularly known as a “double” of oneself, with the exact same appearance but usually with a completely different personality. 
It comes from German folklore (the word is German for “double walker”), where it is believed that seeing a doppelgänger is an omen of bad luck, possibly death. It is also said that meeting one’s own doppelgänger will result in one of the two dying. 
However, in modern times this concept of doppelgängers have been largely replaced by the first meaning, that of an alter ego who is only identical physically, and completely different persona-wise. This can sometimes overlap with the concept of an “evil twin”, as a doppelgänger is sometimes described to have an inverse personality, values and motives.

Although in most cases a doppelgänger is just a look-alike, it could be the result of the brain projecting an identical image of oneself in another space. 
It has been discovered that electrical stimulation of an area of the brain called the left temporoparietal junction causes the sensation that someone is next to you. This “someone” has the same shape and body posture as the subject, and is sometimes described as having a completely different personality. It is reported that this sensation is extremely unpleasant.
The cause of this phenomenon is that the area of the brain is associated with self-image, such as body posture, location and proprioception (sense of what oneself appears as in space). Therefore, a disruption leads to the self-image being projected elsewhere, which the brain then interprets as a doppelgänger.

There are similar mental disorders such as the Capgras delusion (belief that someone close has been replaced by a doppelgänger), Fregoli delusion (belief that many people are the same person in disguise) and subjective doubles (belief that one’s own doppelgänger is acting on its own to interfere with one’s life).

Doppelgängers are common plot devices in many works, especially fantasy and science fiction where the aforementioned “evil twin” concept is used. However, the doppelgänger may also be described as benevolent or simply a clone.
They are notably used in How I Met Your Mother, where each character has a doppelgänger completely different to their persona (e.g. Stripper Lily, Fertility Expert Barney).

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Posted in Science & Nature

Ant Sequence

Find the rule for the following sequence of numbers:

1
11
21
1211
111221
312211
13112221
1113213211

Continue reading “Ant Sequence”

Posted in Science & Nature

Cricket

The sound of crickets in the autumn night is quite inspiring. Only male crickets can make this clear and beautiful sound, by rubbing their serrated wings against each other.

There are four kinds of cricket chirps: an attracting song (for females), a courting song (when a female is near), an aggressive song (when a male is near) and a copulatory song (after a successful mating). Each song is played at a different volume and pitch.

As all insects are cold-blooded, they are heavily affected by temperature. In the case of crickets, this is reflected in the frequency of chirps, which increases proportionately to the temperature. Using this, one can calculate the air temperature from the number of chirps a Snowy Tree cricket makes (count the number of chirps in 14 seconds plus 40 to get the temperature in Fahrenheit).

Finally, cricket chirps cannot be heard via cellphones. This is because a cricket chirp is usually around 6500Hz frequency, while most cellphones operate at a maximum of 3300Hz.

Posted in Life & Happiness

1 + 1 = 3

“One plus one is three. When a person meets another person, three things are established: co-operation, understanding and solidarity.” ~ Edmond Wells (featuring in works by Bernard Werber)

Through this magnificent equation, society and nature alike evolve as two things come together to form something even greater than the sum of themselves.

Only those who can transcend the hard, absolute mathematical logic of 1 + 1 = 2 and appreciate the beautiful philosophy of 1 + 1 = 3 can live life to the fullest and deepen their thoughts.

Posted in Science & Nature

Matador

The word “Spain” often brings upon an image of a handsome matador taunting a fierce bull with his red cape. Because of this, it is commonly thought that the colour red aggravates bulls, and this is often used in cartoons.

However, as bulls are colour blind, they cannot tell a red cape apart from a blue cape. They are actually responding to the movement of the cape and being provoked by the matador. Furthermore, the bulls used in bullfights tend to be a more aggressive breed. This type of charging behaviour is common in large herbivores such as hippos, rhinos and elephants, as it is very useful in nature when faced with a predator.

Also, the real reason the cape is red is not only because it symbolises passion and power, but because it also hides the blood from the bull during the fight.

Posted in History & Literature

3000 A.D.

How will the world change over the next millennium? Everything will change: from lifestyle and culture, to international politics and economics. This makes the posited question extremely interesting.

As science will continue to advance rapidly, technology that can only be dreamed of by modern man will become commonplace in the future. For example, computers will become essential tools such as pen and paper, or possibly become obsolete like the typewriter. Human beings will rely more and more on machines, which may lead to human-machine interfaces and cyborgs, or simply robots becoming common household appliances. Space travel will become as common as air travel, and humanity may even begin to colonise other planets or moons.
As this field can flow in completely unpredictable directions, it is extremely hard to know what will come. One thing is for sure: there is infinite potential in science for at least the next thousand years.

The continuing evolution of medicine and advanced hygiene policies will increase the lifespan of the world. This will bring upon the aging of the population, a “disease” that already plagues some developed nations. Governments may even respond with extreme solutions such as setting an age limit (or killing the elderly to change the demographics), but the more likely option is lengthening the period of youth or reversing aging to prevent the phenomenon of an elderly population.

Socially, the internet will allow for a ubiquitous society, bringing together the entire world. However, the internet is a double-edged sword that may improve interpersonal relationships, but also cause people to become antisocial and communicate only via electronic screens. Unfortunately, it is unlikely the gap between the rich and poor will be filled. The reason being, people’s basic instinct to take from others to improve their own life means that there will always be those who are rich and those who are poor.

In mankind’s history, there have been only a few empires that have survived over a millennium. Even the United States of America that currently is the leading nation is showing signs of deterioration, and China will instead rise to the top over the next few hundred years. But no one knows who will be the strongest power in the year 3000, as even a (currently) weak nation may suddenly strike and claim the throne.
For example, the Roman empire 2000 years ago, the Mongol empire 1000 years ago, and the Ottoman empire 200 years ago have all fallen and have only become pages in history books now.

Even after two vicious world wars, future nations may ignore history’s teachings and cause a third world war, which could involve the use of nuclear weapons. In this case, the world will definitely be unrecognisable compared to now. 
Alternatively, history may take a peaceful course where the concept of “nations” crumble and instead a united world is formed.

An even more interesting thought is “How will future people see us?”. As we mock the unsanitary conditions, violent history and underdeveloped science of the past, the future may laugh at concepts such as paternalism and communism, or even our fashion of jeans and shirts.
On the other hand, it is possible that works such as Harry Potter or House MD will be seen as classics and become the future Shakespearean plays.

As seen from this, the possibilities for the future are endless, and pondering the different futures sometimes bring light to ways to improve the present.