Brass doorknobs automatically disinfect themselves in about 8 hours.
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The hair of an adult man or woman can stretch 25 percent of its length without breaking.
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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.
15
The force of a suction cup is calculated using F=AP.
15
The use of emoticons affects our corresponding brain areas and can actually trigger emotions.
21
A cubic yard of air weighs about 2 pounds at sea level.
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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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