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This activity provides instructions for building a mirrored tube--a smaller and simpler version of a submarine's periscope--that lets you see around corners and over walls.

This activity provides instructions for using cornstarch and water to make an ooze which has the properties of both a solid and liquid.

An ordinary camera has a lens that makes an image on film. In a pinhole camera, a small hole replaces the lens.

Did you know that using a lens one can bend light to make pictures of the world? It's true!