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This lesson is about the first electronic computers.

In this lesson, you can learn about the life and work of the great German composer.

This lesson is about the second generation of computers.

This lesson is about the third and fourth generation of computers.

Even though something is distant, it still can be reached.

Learn about the relationship between rotational motions and artificial gravity.

I bet I can transform cooking oil into soap.

I bet I can make a pine cone close itself.

I bet I can tell how strong your lungs are.

I bet I can raise paramecia in a jar.

I bet I can trick your eyes.

I bet I can make starch disappear using saliva.

I bet I can extract the skeleton of a leaf.

I bet you did not know you could skin a plant.

I bet I can find crystals in onion.

I bet I can make muddy water clean.

I bet I can make you lose your sense of balance.

I bet I can prove that it is worth using sunscreen.

I bet I can create realistic pictures without a camera.

I bet I can make an orange either float or sink in water.

I bet I can make highlighter marks disappear using a lemon.

This lesson is about the life and work of the Polish compositor and virtuoso pianist.

This lesson is about the life and work of the celebrated British zoologist and writer.

In this lesson, you can learn about the history of calendars.