Columbia University has developed an artificial tree that passively soaks up carbon dioxide from the air using "leaves" that are 1,000 times more efficient than true leaves that use photosynthesis.
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Aluminum used to be more valuable than gold!
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A ball of glass will bounce higher than a ball made of rubber.
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Hot water can freeze faster than cold water.
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Indoor pollution is 10 times more toxic than outdoor pollution.
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One 75-watt bulb gives more light than three 25-watt bulbs.
57
The average temperature at 40,000 feet above sea level is -60 F.
56
Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
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