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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One ragweed plant can release as many as one billion grains of pollen!
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The Earth's atmosphere weighs about 5.5 quadrillion tons.
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For every gallon of sea water, you get more than a quarter pound of salt.
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A ball of glass will bounce higher than a ball made of rubber.
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Your brain is 80% water.
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Scientists in Germany have developed a candy that doesn't cause cavities.
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