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How long must a prism-shaped corridor be to render a light-source invisible?
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If we put a mirror millions of light years away and reflected earth, could we see what earth looked like millions of years ago?
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Hair we go..how long does hair last ?
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What is "light" pressure?
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What is a halogen light bulb? What halogen is used and why is this better?
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Is solar energy the same as light energy?
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