Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
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Nearly 50% of the world's scientists are assigned to military projects.
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Sound travels fifteen times faster through steel than through air.
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Scientists are now able to grow 'beating' heart tissue in a lab!
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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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It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
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