Body Parts Your biggest muscle is in your buttocks and is called the glutius maximus.
The first human sex change took place in 1950 when Danish doctor Christian Hamburger operated on New Yorker George Jargensen, who became Christine Jargensen.
The part of your body that grows the quickest until you are five years old is the brain.
The muscle that lets your eye blink is the fastest muscle in your body. It allows you to blink 5 times a second. On average, you blink 15 000 times a day. Women blink twice as much as men.
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