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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A cesium atom in an atomic clock beats over nine billion times a second.
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One cubic foot of gold weighs more than 1,200 pounds!
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One ragweed plant can release as many as one billion grains of pollen!
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Pumice is the only rock that floats on water.
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Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
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