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In this optics activity, demonstrate diffraction using a candle or a small bright flashlight bulb and a slide made with two pencils.

The Ancient Egyptians used a naturally-occurring salt from the banks of the Nile River, called natron, to mummify their dead.

In this activity about light and refraction, learners discover how a lens creates an image that hangs in midair.

In this activity, learners burn a peanut, which produces a flame that can be used to boil away water and count the calories contained in the peanut.