Hydrogen gas is the least dense substance in the world, at 0.08988g/cc.  Hydrogen solid is the most dense substance in the world, at 70.6g/cc.

Random Facts

• Like fingerprints, everyone's tongue print is different.
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• Skunks can accurately spray their smelly fluid as far as ten feet.
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• A duck's quack doesn't echo, and no one knows why.
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• The average person laughs 10 times a day!
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• The airplane Buddy Holly died in was the 'American Pie.' (Thus the name of the Don McLean song.)
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• The Hawaiian alphabet has 12 letters.
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• On December 23, 1947, Bell Telephone Laboratories in Murray Hill, N.J., held a secret demonstration of the transistor which marked the foundation of modern electronics.
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• If you keep your eyes open by force when you sneeze, you might pop an eyeball out.
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