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Ibn al Haytham was born in Basra, in

Iraq, in about 965. Many people then

thought that we see because light

shoots out of our eyes. He tested this

with experiments. He showed that light

travels in straight lines, and that we

see when light from things around us

comes into our eyes. His Book of Optics

was read for centuries. In Europe, he

was called Alhazen.

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