La science à découvert

The Greek Pythagoras is one of the first great mathematicians. Pythagoras and his friends liked to make squares using dots. They studied the number of dots needed to make perfect squares. That's how they started writing numbers in square root form.

2000 years before our era, the Babylonians had already observed that the circumference of a circle is about three times larger than its diameter. Mathematicians do not like approximations.

How can a tiny change in the initial conditions produce a result very different from the one expected? With his board, Galton throws small balls from the top of a studded board. The balls arrive at different places because Galton never throws with exactly the same force and the air never rubs in exactly the same way.

The British scientist Alexander Fleming cultivated bacteria and enzymes in Petri dishes. On his return from vacation, Fleming noticed the appearance of mould in his containers. A fungus was discovered that led to the production of a medication called penicillin.

At the end of the 19th century, Louis Pasteur succeeded in isolating the rabies virus and producing an attenuated strain. Gradually, vaccines became mandatory, which led to the eradication of more and more diseases.

In ancient times, it was thought that blood was responsible for the emotions and was produced in the liver. When blood circulation was discovered in the 17th century and it was understood that the liver does not produce blood, we wondered what purpose this organ could serve.

In the middle of the 18th century, the American Benjamin Franklin demonstrated that clouds contain electrical charges: he flew a kite on a stormy night and proved that natural electricity exists. It is then understood that electricity is a current between a positive charge and a negative charge.

In 1587, Galileo thought that the heavier an object was, the faster it fell because a hammer fell faster than a feather. Galileo decided to test this by rolling a marble down an inclined plane. He found that whatever their size, they travelled down the incline at the same speed.

In the eighteenth century, Lavoisier will eventually decompose and then recompose the air and find its main composition, which is nitrogen and oxygen. It was later discovered that it also contains rare gases and carbon dioxide.

At the end of the 18th century, Antoine de Lavoisier, mathematician and chemist, asserted that in all the reactions of these experiments: 'nothing is lost, nothing is created, everything is transformed' but he could not really prove it.

When the king of Syracuse gave Archimedes the task of proving that a crown was not made only of pure gold, Archimedes discovered in his bath that 'any body immersed in a liquid undergoes, on the part of the latter, a thrust exerted from the bottom upwards and equal in intensity to the weight of the volume of liquid displaced.&…

Democritus already thought in ancient times that matter was composed of small and unbreakable particles which is termed 'atomos' in Greek . Thanks to Lavoisier and John Dalton, the notion of element and atom was defined.

At the beginning of the 19th century, the battery had just been invented and it was thought that there were several types of electricity. Michael Faraday looked at the quantity of gas that emanated from water when a current was passed through it and thus defined the electrolysis of water. In 1833, he published his observations and…