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Water below the surface of Earth

A lesson about the various types of underground waters and...

Do fish drink?

In this lesson you will learn more about the life of fish.

Pitch and frequency, Part I

Experience the relationship between pitch and frequency...

How do animals see?

This lesson presents the vision and the evolution of eyes of...

The Cartesian and the polar coordinate system

Practise how to define a specific location using coordinate...

Space adventurers: Space travel

In this lesson you will learn about the presence of humans in...

Is all that chemistry dangerous?

This lesson helps to explain chemical reactions.

Which came first, the feather or the bird?

This lesson presents which animals developed feathers during...

Where exactly?

Learn how to specify a location in a playful manner!

Planets in our backyard

The lesson illustrates the size of the planets in the Solar...

The giants of the Solar System

This lesson introduces you to the outer planets of the Solar...

Can we vacuum on the Moon?

This lesson explains the concept of atmospheric pressure.

How are rocks made?

You can follow the process of the formation of rocks.

The anatomy of the heart (intermediate)

This lesson introduces the position and anatomy of the heart,...

User manual

A guide about the meaning of icons found in digital lessons...

A glance into space

A lesson about the structure of the Universe and the Solar System.

Where do flies go in the winter?

Houseflies are among the best-known animals, they can be found...

Would you like to get a puppy?

Dogs are our loyal companions. Learn about their anatomy and...

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