WEBVTT - How quickly does hair grow?

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<v Speaker 1>to brain Stuff from how Stuff works dot com where

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

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<v Speaker 1>quickly does hair grow? The answer is it depends. If

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<v Speaker 1>you just got a really bad haircut, it doesn't seem

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<v Speaker 1>to grow at all. But ignoring these perceptual differences, human

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<v Speaker 1>hair seems to grow at a pretty consistent rate of

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<v Speaker 1>about half a millimeter per day, or about half an

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<v Speaker 1>inch every month. It may grow faster or slower depending

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<v Speaker 1>on your age, your genetics, and your hormonal state. For example,

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<v Speaker 1>pregnancy seems to have an effect on hair, but half

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<v Speaker 1>a millimeter per a is a good average. What this

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<v Speaker 1>means is that the maximum growth rate for hair is

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<v Speaker 1>about six inches per year. If you have short hair

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<v Speaker 1>and you're thinking it sure would be nice to have

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<v Speaker 1>hair down to my waist, then you're gonna have to

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<v Speaker 1>wait five or six years for more on this and

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