Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
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Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
Aluminum used to be more valuable than gold!
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Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
Hot water can freeze faster than cold water.
181
The hair of an adult man or woman can stretch 25 percent of its length without breaking.
116
Brass doorknobs automatically disinfect themselves in about 8 hours.
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