The Earth's atmosphere weighs about 5.5 quadrillion tons.
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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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Scientists in Germany have developed a candy that doesn't cause cavities.
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Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
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One third of the electricity produced on earth is used to power electric light bulbs!
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Because heat expands the metal, the Eiffel Tower always leans away from the sun.
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In zero gravity, a candle's flame is round and blue.
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