One cubic foot of gold weighs more than 1,200 pounds!
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Scientists have developed a microparticle filled with oxygen that can be injected into the blood stream, enabling us to live without breathing.
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Pumice is the only rock that floats on water.
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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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A cubic yard of air weighs about 2 pounds at sea level.
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Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
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