Is glass a liquid or a solid?

A lesson about the special properties of glass, the process of glassmaking and the various types of glass.

What is infrared radiation?

In this lesson you can learn about infrared radiation.

Is air visible?

This lesson introduces the properties of air.

The wave phenomena of sound

When does echo form? Why does sound spread easier at night? What is the secret to a good concert hall?

Can we vacuum on the Moon?

This lesson explains the concept of atmospheric pressure.

What material are objects made of?

Learn about the properties of materials that objects around us are made of.

Cardiovascular diseases Part 1

This lesson presents some types of cardiovascular diseases, including their diagnoses and treatment options.

Why are there deserts and ice sheets on Earth?

This lesson explains the reasons and consequences of the formation of climatic zones.

The companion of Earth

This lesson explains the phases, the internal structure and surface of the Moon, as well as its effects on the Earth.

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