Why is smoking addictive?

Before giving explanations, let's start with some depressing figures! An addict person smoking his cigarette “Tobacco kills up to half of its users” “Tobacco kills around 6 million people each year. More than 5 million of those deaths are the result of direct tobacco use while more than 600 000 are the result of non-smokers being exposed to second-hand smoke”. (World Health Organisation, 2015) Now you're warned, so we can...

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Why do we use QWERTY keyboards?

Take a moment to observe your keyboard. The letters seem to be randomly arranged but it is not actually truth! The famous QWERTY keyboard In the USA, through the standardization period, there was a huge competition to create a single typewriter standard. In 1873, the first typewriter is commercialized by Remington & Sons. It was designed by Christopher Sholes, Wisconsin senator and sometime newspaper editor, and it already used the...

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Why do mosquito bites itch?

Everybody knows this horrible feeling which can make crazy! A red bump on your skin which persistently itch you! A damn mosquito biting a poor human  As you probably know, mosquito season starts slowly in the spring, peak in the summer and tapers off when the weather gets cold. Mosquito is the most active a few hours before sunrise and a few hours after sundown, be careful! Both male and female mosquito feed on flower nectar. Only...

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Why do dogs wag their tails ?

The most common idea is that a wagging tail means that the dog is happy. Actually, this is no exactly true! Indeed, dogs use their tails to communicate strong emotions. It could be annoyance, anger as well as hapiness. So by a wagging tail, a dog can try to convey "Please, pet me!" or "Don't even try to come closer, idiot". As their language is mostly based on the position and the motion of their tails, we have to observe it to get their emotional...

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Why is the sky blue ?

Every day, when we go outside, we can see that the sky is blue. But, why blue ? The blue sky you would like to see everyday To summarize, the sunlight is made up of all colors of the rainbow. Those colors are defined by a specific wavelength, each color has its own. When all colors are mixed, it seems white. But it is also possible to break them down to observe colors separately. Our atmosphere is composed of an incredible number of...

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