Why do we yawn?

Like many of us, you probably think that people yawn when they are hungry or tired. Actually, this is not exactly true! After many studies, all scientists do not explain this phenomena the same way. A whole family happily yawning together Yawn to make our brain colder One of those theories is the one of Dean Falk, an anthropologist. He think that we yawn for make our brain colder. Indeed, when we are tired our brain is warmer than its...

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Why are rugby balls egg-shaped?

It could be surprising but first rugby balls were round. Rugby balls have become egg-shaped 50 years later! An example of beautiful egg-shaped rugby ball How was the rugby invented? In 1823, while a football match at the college of Rugby, a town in United Kingdom close to Birmingham, William Webb Ellis, one of the students, grabbed the ball with his hands to drive it into the opponent goal. The ball provided from the Rugby's shoemaker, William Gilbert who...

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Why do we have different time zones around the world?

If you have already traveled, you probably know that the time is different according the country you are in. You can even save time by travelling! For example: if your flight leaves Paris at 10am, he will be in New York at 11am, local time. However, your flight would have lasted in reality 7 hours and have crossed 6 different time zones. Different time according their own time zone Until 1891, each town determined its own time according...

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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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