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Speaker 1: Stuff happens, just don't let it happen to your photos, music,

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Speaker 1: dot com. That's m o z Y dot com. Welcome

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Speaker 1: to brain Stuff from how Stuff works dot com where

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Speaker 1: smart happens. Hi, I'm Marshall Brain with today's question, how

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Speaker 1: quickly does hair grow? The answer is it depends. If

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Speaker 1: you just got a really bad haircut, it doesn't seem

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Speaker 1: to grow at all. But ignoring these perceptual differences, human

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Speaker 1: hair seems to grow at a pretty consistent rate of

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Speaker 1: about half a millimeter per day, or about half an

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Speaker 1: inch every month. It may grow faster or slower depending

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Speaker 1: on your age, your genetics, and your hormonal state. For example,

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Speaker 1: pregnancy seems to have an effect on hair, but half

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Speaker 1: a millimeter per a is a good average. What this

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Speaker 1: means is that the maximum growth rate for hair is

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Speaker 1: about six inches per year. If you have short hair

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Speaker 1: and you're thinking it sure would be nice to have

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Speaker 1: hair down to my waist, then you're gonna have to

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Speaker 1: wait five or six years for more on this and

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Speaker 1: thousands of other topics. Is it How stuff works dot Com?

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Speaker 1: today at m o z y dot com