Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
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For every gallon of sea water, you get more than a quarter pound of salt.
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A cubic yard of air weighs about 2 pounds at sea level.
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One ragweed plant can release as many as one billion grains of pollen!
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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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4.5 pounds of sunlight strike the Earth each day.
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According to studies, men change their minds two to three times more often than women.
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The bark of an older redwood tree is fireproof.
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