Why do human grow extra-long hair?

Pethesedzao

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The sharpest "knife" at Paul's time could be a flint or an obsidian knife. Even with that, "chopping" (no scissors!) human hair is not anyway better than pulling it.

How frequent was a Roman soldier get his hair chopped? chopped to how short?
Paul was writing to the Greek believers
 
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Hank77

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Each hair, however, only lives a few years before falling out.
I remember when the singer, Crystal Gayle's, hair was down past her knees. It takes several years for hair to grow that long.
 
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Warden_of_the_Storm

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I don't mean people then could not trim their hair. I just mean that hair-cut should not be a common thing to do at that time.

It actually might have been.
Scissors:
The earliest known scissors appeared in Mesopotamia 3,000 to 4,000 years ago. These were of the 'spring scissor' type comprising two bronze blades connected at the handles by a thin, flexible strip of curved bronze which served to hold the blades in alignment, to allow them to be squeezed together, and to pull them apart when released.

Spring scissors continued to be used in Europe until the 16th century. However, pivoted scissors of bronze or iron, in which the blades were pivoted at a point between the tips and the handles, the direct ancestor of modern scissors, were invented by the Romans around 100 AD.
 
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Hank77

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The sharpest "knife" at Paul's time could be a flint or an obsidian knife. Even with that, "chopping" (no scissors!) human hair is not anyway better than pulling it.

How frequent was a Roman soldier get his hair chopped? chopped to how short?
Sharpened iron
 
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Tanj

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So the individual cells last a lifetime do they?

Right. For most tissues. Brain, lung, heart, kidney, spine, muscle. It's really only the endo- and epi-thelial cells that regenerate. And liver.

Maybe their lifetime.

umm...well...what else, somebody elses lifetime???
 
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Par5

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Why do they grow long hair? Because they can. I wish I could, in fact, I just wish I could grow hair. Each morning I wash my face that little bit further back. It has got to the stage that when the sun shines on my forehead, I dazzle approaching motorists.
 
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juvenissun

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It varies by individual. I didn't have a hair cut between ages 18 and 32 and it never went past my shoulders.

Really? That is interesting. Thanks.
According to the hair-drop idea, your hair dies too young. We should get an average value on how long could human hair grow.
 
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juvenissun

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Why do they grow long hair? Because they can. I wish I could, in fact, I just wish I could grow hair. Each morning I wash my face that little bit further back. It has got to the stage that when the sun shines on my forehead, I dazzle approaching motorists.

Ha ha ha ...
Thanks.
 
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juvenissun

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700-20_calm-dog-breeds-medium_not-too-big-not-too-small-these-dogs-are-the-definition-of-a-happy-medium-and-probably-why-they-show-up-on-our-list-of-most-popular-dogs-year-after-year-.jpg

When you look at this hairy dog, won't you feel the evolution process did something wrong?
 
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juvenissun

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I haven't seen any data cited in this thread. How long does human hair grow compared to, say, orangutans?

I don't know. I wish someone would tell me how long an orangutan can grow its hair. I just sense that human has unusually long hair without any obvious purpose.
 
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Shemjaza

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When you look at this hairy dog, won't you feel the evolution process did something wrong?
Weird fluffy dogs have advantageous traits because humans will help them breed and provide them with plenty of food.

If long impressive hair (on average) encouraged breeding then it would be an advantage. If it just wasn't a major problem it could coast along on positive traits like other neutral human traits like prominent chins and pointy noses.
 
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juvenissun

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Exactly. Because it's not even worth consideration.

If it does not matter, why would human, in particular, man, soldiers want to cut the hair short? Why would the evolution process want to make this trouble?
 
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juvenissun

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Weird fluffy dogs have advantageous traits because humans will help them breed and provide them with plenty of food.

If long impressive hair (on average) encouraged breeding then it would be an advantage. If it just wasn't a major problem it could coast along on positive traits like other neutral human traits like prominent chins and pointy noses.

You are too optimistic. I would say only about a few percent of dog lover would choose such a dog. Would you like to spend a fortune on this dog to clean and comb its hair all the time?
 
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Shemjaza

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You are too optimistic. I would say only about a few percent of dog lover would choose such a dog. Would you like to spend a fortune on this dog to clean and comb its hair all the time?
That's not optimistic, it's a statement of fact.

Those mutations were specifically encouraged and supported by humans. They were an advantage to those lineages.
 
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