Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
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The Earth's atmosphere weighs about 5.5 quadrillion tons.
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Each day is longer than the previous on by 0.00000002 seconds which is 13 seconds each century!
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It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
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One gallon of used motor oil can ruin approximately one million gallons of fresh water!
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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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The average home creates more pollution than does the average car.
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