Balsa wood is classified as a hard wood!
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One cubic foot of gold weighs more than 1,200 pounds!
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For every gallon of sea water, you get more than a quarter pound of salt.
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There are more than 270 people cryogenically frozen in the hope that one day the technology will exist that can revive them and extend their lives.
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The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
Cellophane is not made of plastic. It is made from a plant fiber, cellulose, which has been shredded and aged.
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Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
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