On the track of the rain - Savannahs

The flora and fauna of the savannahs adapt to the climate.

Colour vision test

Red-green colour deficiency is a genetic condition.

Giant rivers at the Equator

The largest rivers on Earth are found in the tropical zone.

Upside-down glass of water

This video demonstrates that the force resulting from air pressure acts upwards too.

Dancing coin

This video demonstrates the expansion of gases with the help of a bottle and a coin.

The history of lighting

Nowadays it is perfectly natural to turn on the lights. But it has not always been that way.

3D graph tutorial

Let's find out how to use the 3D graph tool.

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