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
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
Brass doorknobs automatically disinfect themselves in about 8 hours.
18
At room temperature, the average air molecule travels at the speed of a rifle bullet.
55
Cold water weighs more than hot water.
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One ragweed plant can release as many as one billion grains of pollen!
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