Modern humans first appeared about 200,000 years ago, but record keeping didn't begin until about 6,000 years ago. That means about 97% of human history is lost.
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The world's shortest man measures only 21.5 inches.
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A human brain produces as many as 12,000 to 50,000 thoughts per day, depending on how deep a thinker a person is.
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Tigers can see 6 times better at night than humans.
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Every human spent about half an hour as a single cell.
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There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
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There are about 255 babies born worldwide every minute.
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