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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