Subjects

Heard on the radio

The protective mask through History

If there is one object that symbolizes the coronavirus pandemic that affects the entire planet these days, it is the mask. A small square of plastic or fabric that has become essential to protect ourselves from the spread of Covid-19. This accessory, which acts as a barrier to microbes and other harmful substances, is not new. Thanks to the observation of the first “scientists” and doctors of the past, the mask was created, it must be said, to protect us. Here is the little story of the mask. […]

Biology

Grow peppers from pepper waste

You’ll never buy pepper seeds for your vegetable garden again with this tip. With this simple experience, you will understand what a seed needs to germinate. Does it need light or dark? Is it possible to germinate them faster? […]

Botany

The tree leaves are red

The leaves of trees are green in daylight. It is thanks to chlorophyll, an important molecule which is involved in photosynthesis to convert carbon dioxide into oxygen. But under black light, chlorophyll is red. A phenomenon linked to fluorescence. […]

Chemistry

A treasure map with invisible ink

Invisible ink is very useful for drawing treasure maps or writing secret messages. Only those who know chemistry will find a way to reveal your message. Let’s use onion juice to prepare the invisible ink. […]

Experiments

The color decomposition of your markers

The primary colors are cyan, yellow and magenta. Three colors from which all others derive. One way to find out what the color of the felt-tip pens is made of is to play with water, a coffee filter and use the principle of capillary action. […]

Subjects

When confinement is used to develop the greatest theories of physics.

Isaac Newton, the famous English physicist who developed the theory of universal gravitation, was also confined 3 centuries earlier. London was then hit by the Great Plague. When he was a student, the University of Cambridge sent the students home to comply with the rules of confinement, as today we have to do with the Coronavirus. This genius knew how to use his time to develop his theories in optics and solve mathematical problems. […]