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The magic chain

A spectacular optical illusion using a chain of closed rings.

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Pitch and frequency, Part I

Experience the relationship between pitch and frequency through...

Let’s get to know the sources of sound!

Let's use musical instruments and our vocal cords as sources of sound.

Cartesian diver

Objects denser than water sink in water.

The wave phenomena of sound

When does echo form? Why does sound spread easier at night? What...

Sound waves all around us • Part 2

In this lesson you will learn more about how sound propagates.

Boiling at room temperature

Water boils at 100 degrees Celsius. But is it possible to boil...

Plastic bottle rocket

In this experiment, we convert a plastic bottle into a rocket.

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