Author: Jinavie

Posted in Philosophy

The Minds Of Others

Posted on by Jinavie

How do we know that the world we perceive is the same as other people? How do we know that what I call “red” looks the same to another person? How do we know that other people are hearing the same music, smelling the same scent or even feeling the same emotions that we do? We infer from other people’s behaviours that fundamentally, we are all the “same”. We see other people enjoy the same things as us or think along the same lines as us, then we empathise.

However, as human beings, we are unable to read other people’s minds. All we can do is interpret people’s speech and behaviour to try gauge what they are thinking. This means that technically speaking, we can never truly know that other people have minds of their own. For all you know, the person in front of you could be an automaton that is programmed to respond to their environment in a manner similar to you.

As discussed above, we subjectively know (or assume) that other people have minds of their own, given what we observe. But then what of animals, artificial intelligence or even comatose people? How can we know that they have a conscious mind? The short answer is that there is no black-or-white answer, but it sure is an interesting philosophical discussion to ponder – one which has been pondered for millennia. This is the problem of other minds.

We cannot objectively “see” or read into another conscious mind. However, we can approximate what that mind is like from the person’s behaviour – their words and their actions. This is almost like sketching an animal that you have never seen just by listening to someone giving you an account of it. Therefore, if you want to get to know someone – to understand their mind, their essence, their soul – all you can do is talk with them, sketching out the finer details as the conversations get deeper and deeper.

Posted in Science & Nature

Fusion

Posted on by Jinavie

One of the greatest challenges for modern science is unlocking the secret of nuclear fusion. Nuclear fusion presents the opportunity for humanity to obtain an extremely efficient yet surprisingly clean source of energy. Einstein’s famous equation – E=mc² – shows the relationship between energy and mass. It turns out that all matter is essentially energy, meaning that by breaking apart the matter to its basic constituents, you can unleash energy.

When two hydrogen atoms are collided together at extremely high speeds, the two protons join with enough energy to form deuterium, while releasing energy. As more hydrogens are collided, helium is formed while releasing more energy and also hydrogen, which can fuse with other hydrogen to start more reactions. This is a chain reaction. Once the chain reaction is established, the fusion reaction will keep producing immense amounts of energy until it uses up all the hydrogen available.

However, there are two main problems we are still trying to solve when it comes to unlocking fusion. The first is generating enough energy to kickstart the chain reaction in the first place, which is called ignition. The second is containing this immense energy, as the intense heat produced would melt any material we can produce to contain it.

This brief overview of nuclear fusion also offers a lesson in life. Most of the good things in life are not single events, but self-sustaining processes. Things like good habits, happiness and human relationships. To form a good habit, you must invest incredible amounts of time, resources and willpower. To start a relationship, you need to make an effort to show the other person how much they mean to you. To be happy, you need to completely change the way you perceive the world.

The best things in life do not happen by accident, but because you made an effort to ignite the chain reactions. Of course, you will constantly need to maintain those reactions so they don’t explode on you, but at the end of the day, starting is really half the battle.

(Couldn’t come up with an appropriate picture for this article……..so here’s a gif of Groot dancing)

Posted in History & Literature

Morse Code

Posted on by Jinavie

In 1825, an artist by the name of Samuel Morse was travelling to a city far from his home to paint a commission. While working on his painting, he received a letter from his father, which informed Samuel that his wife was ill with an infection. The next day, another letter came, but this time detailing his wife’s sudden death. Upon receiving the letter, Morse immediately returned to his home as fast as possible, but he arrived after they had already buried his wife. This was the age before fast long-distance communication, where messages could only be sent as fast as the horses that carried them.

Frustrated by the inefficient communication methods of his time, Morse became dedicated to devising a better way to send messages over long distance at a much faster speed. After intensive studying of electromagnetism, Morse eventually developed the first concept of a single-wire telegraph. The telegraph could send electrical signals of variable length at fast speeds down wires with a simple button.

Together with the telegraph, Morse devised a code alphabet so that messages could be sent encoded into short and long signals on the telegraph. A dot (“dit”) represents a short press, a dash (“dah”) represents a long press (three times longer than a short press). Each letter is separated by a space the length of 3 dots. Words would be spaced out by a slightly longer pause – the length of 7 dots. Morse designed the code to be efficient and so he made the most common letters (E, I, S, T and so forth) the shortest in length.

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Posted in Psychology & Medicine

Money And Happiness

Posted on by Jinavie

They say money cannot buy happiness. But everyone eventually comes to the realisation that in the world we live in, this is a lie. Who hasn’t felt the thrill of retail therapy – feeling joy from purchasing something they have always desired, from expensive clothes to delicious dessert? It is difficult to persuade a starving person that “money cannot buy happiness” when even a small donation could mean that person being happy from a full stomach.

Of course, this is a literal explanation of the saying. The lesson from the saying is more that money is not the only thing that can buy happiness. Some of the greatest joys a human being can experience – such as connection, love and humour – are virtually free.

That being so, having money gives you the luxury of being able to enjoy even the free things more, because there is one resource that money can buy and that is time. If you are spending less time having to earn a living, then you have more free time to enjoy hobbies and social activities that will bring you happiness. Ergo, money does not equal happiness, but it sure helps your happiness to have enough money.

As mentioned above, money can bring direct happiness as well from purchasing things. However, most of the “happiness” we receive from buying things is from dopamine, meaning it is short-lived and not sustainable.

A better use of your money is purchasing experiences. If you spend your money to go travelling or do an activity like skydiving, the happiness you feel will be linked to the memory and you will be able to reminisce about it in the future. And if you cannot afford an expensive adventure, you can still buy a cup of coffee and catch up with a friend.

Posted in Science & Nature

Zero Gravity

Posted on by Jinavie

With the development of technology, we are now at a point in history where there is an abundance of video footages taken in space. Thanks to this, the general population can visualise the strange phenomenon that is the lack of gravity in space. We are able to see videos of objects and astronauts gently floating and even strange phenomena such as tears simply pooling around a person’s eyes rather than streaming down the face. Most of these scenes are from places such as the International Space Station which is in orbit around the Earth, as there has been no expeditions leaving Earth’s orbit since the last moon landing in 1972.

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However, the common misconception is that objects in space stations are in zero gravity conditions. Objects in orbit are still under the influence of Earth’s gravity, which is why they do not fling out into the depths of space. So why do astronauts in space stations look like they are not under the influence of gravity? The reason is that an object in orbit is travelling incredibly fast.

The International Space Station is about 420km above the surface of the Earth. Here, it experiences about 90% of Earth’s surface gravity, meaning that theoretically, it should fall straight back. However, the ISS is travelling at 8km/s (27600km/h) sideways at the same time – the orbital speed. Because of this, the ISS is falling back to Earth at the same rate as it is travelling tangentially away from Earth. This makes it travel at a blistering speed in a circle around the Earth.

Not only is the ISS free-falling around the Earth, but so is its contents. Therefore, the astronauts inside look like they are in zero gravity, but are in fact simply in free-fall, much like a skydiver. In this state, they experience no “weight” as the g-force becomes zero and the astronauts accelerate at the same rate as the ISS. Ergo, the astronauts are “weightless”, not in “zero gravity”. This condition can be simulated on Earth in the so-called “Vomit Comet” – an airplane designed to fly up and down along a certain path, to produce a weightless, free-fall when it falls.

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Posted in Science & Nature

Turing Test

Posted on by Jinavie

Alan Turing was a brilliant British mathematician who was pivotal in cracking the German Enigma cipher using a complex computing machine. He was highly influential in the founding of computing science. One of his greatest areas of interest was artificial intelligence. Like other computer scientists of the time, Turing predicted that machine intelligence was possible in the future with rapid development of computers. On this topic, he proposed the following question: at what point is a machine truly “intelligent”?

Intelligence is too complicated to define neatly in a single line. Therefore, here is a simpler question: can a machine do what we can do? For this, he proposed a thought experiment based on a party game known as the imitation game. In the imitation game, a man and a woman go into separate rooms. Guests then try to tell who is a man and who is a woman by writing a series of questions, slipping it under the door, then receiving a typewritten answer. If the guests cannot tell the two apart, the two win the game.

Turing modified this game into what is now known as the Turing test. He proposed replacing one person with a machine. A person and a computer are placed in separate rooms and are asked the same question by a judge. They then give a typed response. If the judge cannot confidently tell who is human and who is not, then the machine passes the Turing test.

Of course, the Turing test was not designed as a formal assessment and is merely a thought experiment. It has plenty of weaknesses, such as the fact that it only tests whether the machine is acting “like a human” rather than “intelligently”. For example, some computers have passed the Turing test by intentionally making typos to mimic human behaviour. Some have argued that machines that pass the Turing test do not truly exhibit intelligence, as it is impossible to tell if they fully understand the language or whether they are just running algorithms on symbols that the machine does not understand.

Regardless, the Turing test opens the door on the exciting yet frightening world of artificial intelligence and what the future holds for humanity.

Turing Test

(Image source: http://xkcd.com/329/)

Posted in Science & Nature

Dust Explosion

Posted on by Jinavie

When we hear explosives, we commonly think of chemicals such as nitroglycerin or gunpowder. But an explosion is essentially just a rapid release of energy and expansion of gases due to combustion. This means that if something is combustible – that is, it can burn – it has the ability to explode. However, certain conditions have to be met so that the combustion can be sudden and rapid.

Because of this principle, it is possible to explode dust or other powdered substances. If the dust is combustible (such as flour or coal), suspended in the air at enough concentration in a confined space, with sufficient oxygen and an ignition source, a dust explosion can occur. For example, coal dust explosions are a common threat to miners and there have been countless incidents where mills and factories have exploded with great fury due to a dust cloud forming from grain, flour, powdered milk and sawdust etcetera.

The reason why dust will explode in such a condition but not when it a pile of dust is lit with fire is that in a dust cloud, every dust particle is in contact with air. This massively increases the surface area of the dust relative to its mass, meaning there more reactions can occur. In this case, the reaction is oxidisation of the substance, leading to combustion. This is why the finer the dust or powder, the greater the risk of an explosion. Even substances such as wood or aluminium can create an explosion when finely powdered enough.

The greatest casualty due to a dust explosion was in 1942 when a coal dust explosion in a Chinese mine killed 1549 miners. Another famous case was in 1878 when the Washburn “A” Mill in Minneapolis exploded, leading to the destruction of the world’s largest grain mill and five other mills. This reduced the city’s grain production to almost one-half.

Posted in Science & Nature

Voyager

Posted on by Jinavie

In 1977, NASA launched into space two unmanned probes named Voyager 1 and 2 respectively. These probes were designed to study Jupiter and Saturn and were not expected to function past this point. The original Voyager mission officially ended in 1989 when Voyager 2 did a close flyby of Neptune. However, as of 2014, both Voyagers are still travelling ever onward into interstellar space, sending back crucial data about our solar system and what is inside it, along with beautiful photographs of the planets.

The two Voyager probes greatly outlived their expected lifespan and exceeded what they were expected to do. Thanks to the Voyager program, we now have a far better understanding of our own Solar System, such as the fact that it is asymmetrical, or that Neptune had three rings. Voyager 1 is now the most distant man-made object from Earth – with its closest neighbour, Voyager 2, being billions of kilometres away from it. Yet it continues to strive onwards into the unknown, exploring the depths of space all alone.

The Voyagers also carry a golden record on which scientists recorded pictures, sounds and music (such as Bach and Mozart) that represented scenery found on Earth. It also includes various languages, mathematic formulas, a representation of our Solar System and our DNA, anatomy and reproduction. It is meant to be a time capsule of Earth, for our future descendants or whatever else may be out there.

Posted in Psychology & Medicine

Dark Circles

Posted on by Jinavie

One of the most tell-tale signs that someone is extremely tired or sleep deprived is having dark circles around the eyes. The skin beneath the eyelids are very thin – almost a quarter of the thickness of skin elsewhere on the body.

During times of exhaustion, the skin becomes paler due to a number of factors. The paleness makes it easier to see the blood vessels running under the skin, which shows as a greyish-blue tint. The more vessels that can be seen and the paler the skin, the darker the circle appears.

Dark circles appear to be an inherited trait, most likely related to the thickness and transparency of your skin. It is also more common in people with hay fever, anaemia and liver problems. The only real treatment for dark circles is rest.

Posted in Philosophy

Eternity

Posted on by Jinavie

“High in the North in a land called Svithjod there is a mountain. It is a hundred miles long and a hundred miles high and once every thousand years a little bird comes to this mountain to sharpen its beak. When the mountain has thus been worn away a single day of eternity will have passed.”

~ Hendrik Willem van Loon