Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
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An Indian man known as "Snake Manu" can put small snakes, including deadly cobras, into his mouth and pass them out through his nose.
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In Ancient Greece, small penises were desirable, and big ones were for ‘old men and barbarians’
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You can hear the blood flowing through your ears if you find a quiet place and cover them tightly.
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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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Our eyes are always the same size from birth, but our nose and ears never stop growing.
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The average sperm cell swims at 8 inches per hour.
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An average heart beats 100,000 times a day, pumping some 2,000 gallons of blood through its chambers. Over a 70-year life span, that adds up to more than 2.5 billion heartbeats.
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