Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
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It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
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In Arizona, a solar wind energy tower has been proposed that would generate as much energy as the Hoover Dam.
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A cubic yard of air weighs about 2 pounds at sea level.
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Balsa wood is classified as a hard wood!
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Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
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Sound travels about 4 times faster in water than in air.
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Neanderthal man had a brain capacity 100cc larger than modern man's.
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