During photosynthesis, plants emit light humans can’t see, but NASA can see that light from space - and they've even made maps of it!
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A cubic yard of air weighs about 2 pounds at sea level.
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Iron weighs more after it rusts.
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At room temperature, the average air molecule travels at the speed of a rifle bullet.
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Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
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Pumice is the only rock that floats on water.
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Out of all the senses, smell is most closely linked to memory.
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Approximately 70 percent of the earth is covered by water. Only 1 percent of this water is drinkable.
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