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How Does Hair Know When to Stop Growing?

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The hair on your scalp can get really long, but your leg hair doesn’t sweep the floor. Why not? Hosted by: Hank Green ---------- Dooblydoo thanks go to the following Patreon supporters -- we couldn't make SciShow without them! Shout out to Christopher Prevoe, Justin Ove, John Szymakowski, Peso255, Ruben Galvao, Fatima Iqbal, Justin Lentz, and David Campos. ---------- Like SciShow? Want to help support us, and also get things to put on your walls, cover your torso and hold your liquids? Check out our awesome products over at DFTBA Records: http://dftba.com/scishow Or help support us by becoming our patron on Patreon: https://www.patreon.com/scishow ---------- Looking for SciShow elsewhere on the internet? Facebook: http://www.facebook.com/scishow Twitter: http://www.twitter.com/scishow Tumblr: http://scishow.tumblr.com Instagram: http://instagram.com/thescishow Sources:http://www.webmd.com/skin-problems-and-treatments/hair-loss/science-hair?page=2 https://www.aad.org/dermatology-a-to-z/for-kids/about-hair/how-hair-grows http://www.loc.gov/rr/scitech/mysteries/grayhair.html http://physrev.physiology.org/content/81/1/449#ref-533 http://www.livestrong.com/article/109520-eyebrow-growth-rate/ http://stemcells.nih.gov/info/basics/pages/basics1.aspx http://physrev.physiology.org/content/81/1/449#ref-533 http://news.yale.edu/2011/09/01/yale-scientists-find-stem-cells-tell-hair-its-time-grow
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Текстовые комментарии (825)
Manisha Bhaittrai (6 дней назад)
I want to grow my hair long but it is not growing it is of same length it doesn't grow more than that and I want to know why this is happening I want to grow my hair up to waist 😩😩😩
official latestpunjab song (7 дней назад)
How to stop hair to grow
Noah (13 дней назад)
Thank you for this
TheRABIDdude (18 дней назад)
*2:01** heyy*
Ikon StOlEmYkOnBat (24 дня назад)
Transitioning is hard Have permed hair but I'm going to curly thick hair. It's growing but grows slow
Teresa Neff (26 дней назад)
Does the hair on your legs stop growing if you’re not having circulation
wexer82 (1 месяц назад)
This is clickbait! The answer is that scientists are still trying to figure it out. I got tricked into learning all this awesome stuff about hair. Thank you.
Brian Anderson (2 месяца назад)
2:04 we don't know yet.
Sneha Mishra (2 месяца назад)
be slow and speak
Sepear (3 месяца назад)
I am a bit confused. If we are to cut hair that is already "fully grown", such as our arm hair, would it not grow back until the hair is shed from the follicle and a new one begins to grow?
Anthony Ong (3 месяца назад)
Question! How does our skin know where to grow hair?
TheFlamerwolf 12110 (3 месяца назад)
The way I see it is that kids and teens hair grows up over there face but as your adult your 4head is shown more why is that
D O M I N O - Y U R I (3 месяца назад)
I hate how my body works, I take a shower in the morning, wait a few hours, and the armpit hair is already visible again, and the pores where the hair on my legs come out of are also clearly visible. If i don't shave my leg hair for like 2 days, it will be so long. I can't even wear tank tops anymore
Just In (4 месяца назад)
If only the hair on my head knew how to not thin out... Thanks for that one dad.
Dilpreet Singh Dilpreet Singh (4 месяца назад)
does hair follicle come back after it dies by later??
Dave Barrack (4 месяца назад)
So what is the difference between body hair and fur? Both have a terminal length. Are they the same thing, but we just call them different things to make ourselves feel special and slightly further separated from animals?
Abhishek Shroff (5 месяцев назад)
How to stop growing of hairs on leg forever
Glazzing Sun (5 месяцев назад)
What if ur hair grows like 2 inch every month ;-;
Daniel Domino (6 месяцев назад)
What happens when someone has a cast on one arm for a long period of time, and when it gets removed, the arm comes out a lot more hairy than the other?
Eight Great (6 месяцев назад)
Why do i have hair growing on my neck in front my throat
Rhys Logan (6 месяцев назад)
OK but if hair stops growing doesn't that make it fur?
Piano Girl (6 месяцев назад)
I once accidentally shaved my eyebrows in 8th grade. Had to wear Sharpie for months lol.
Gachaversejackie XD (7 месяцев назад)
I'm 12 and my hair grows so long:(
Klaus Hoxha (7 месяцев назад)
But there’s this woman that has super long hair can someone explain that to me
Rayan Ighil (7 месяцев назад)
Of course there is a system it's the big bang that made sure that our hair doesnt grow for ever what a great coincidence
Fae (7 месяцев назад)
Geekish Goddess (7 месяцев назад)
Why is my leg hair curly like my hair
Carlos Ramirez (8 месяцев назад)
"How does hair know to grow... Does it touch your brain?"
Noob Gaming102 (8 месяцев назад)
Did you know if you keep removing the hair from the root your body will stop that one strand from growing because it thinks it’s not needed anymore
craig ferguson (8 месяцев назад)
God don’t play 🙏🏾
LydiA Jkessi (8 месяцев назад)
I think my hair stop growing when it reaches bottom of my chest is that possible
mos ab (8 месяцев назад)
So, when a hair in catagen or telogen is cut, it won't grow back?
Batabii (8 месяцев назад)
But why does my scalp hair not seem to grow as fast as other people's? I can't seem to get it to reach waist-length
Ronald Borla (8 месяцев назад)
Short answer: "We don't know" In my mind, what's the point of the video, then?
masterofthecontinuum (8 месяцев назад)
when the hair detaches itself from the root, how is it still connected to the arrector pilli and able to stand up? and when the hair falls out, what happens with this muscle connection? does it detach and reattach to hairs as they grow, fall out, and are replaced?
ℛɛᴛʀᴏ ℛɛᴅ (8 месяцев назад)
Here's another one: why do black people's hair grow slower than white people hair.
I Seek Revenge (8 месяцев назад)
but why does my head hair stop growing at the point when it gets to my shoulders (am black)
Sean Peacock (8 месяцев назад)
I have 2 individual eyebrow hairs that grow about twice as long as the rest. It is occasionally annoying.
Jimmy Joe (8 месяцев назад)
I don't remember seeing my arm or leg hair fall out, only eyelashes, armpit/pubic and head hair.
Red Point (8 месяцев назад)
So... No Rapunzel.... Allright...
GoldonLocks (8 месяцев назад)
I have a hair on my arm that does not retract, I got it to 2 inches before, it’s easily removed with some scissors
BlackTec Playz /BT (8 месяцев назад)
Evanston Conner (8 месяцев назад)
I wish we can control hair groth by folicue
NWA362 (8 месяцев назад)
Bruce Lee eyebrows was full and he also had a lot of hair on his head mean his genes was dope!! love how full his eyebrows were..
Shadow /Porcelain (8 месяцев назад)
Im guessing in some cases it doesnt work well because ive had a single strand of arm hair be really long
Harsh Kukadia (8 месяцев назад)
does plucking stop hair growth ?
UNSC INFINITY (9 месяцев назад)
What about my Ass Hairs?? ... It's like a freakin Amazon Jungle down there!!
joy (9 месяцев назад)
Hello hank Green
goodman854 (9 месяцев назад)
This didn't really answer the question for me. I want to know if I cut this hair on a mole if it will grow back
Space Cat 91c0 (10 месяцев назад)
After a hair cut within three days you can tell my hair is growing back
DodgeMartin (10 месяцев назад)
While I was watching this I couldn't stop looking at his hair
iZorohhh (10 месяцев назад)
Well my eyebrows stopped growing for a while and one side of my eyebrow looks like it is shaved off...
Terren Maplethorpe (10 месяцев назад)
I got a add for male pattern baldness for this video
darrick steele (10 месяцев назад)
When people grow their hair as long as it will grow it usually tends to stop growing at about the waist line. But if they cut it back, it will grow again until it gets back to the waist. Some people can grow their head hair all the way past the ankles, I had a cousin with hair that long. Her hair seemed to just keep growing for ever. I am still wondering how hair knows that it's waist long.
Mfbsmd sifsai (10 месяцев назад)
why does my hair grow faster in some areas?
Jognt (9 месяцев назад)
Because it is genetically programmed to do so. Each hair on your body is pretty much unaware of the other hairs on your body. It just does its thing.
me tube (11 месяцев назад)
Leongon draws stuff (11 месяцев назад)
God damn it... the answer at the end of the video is "We don't know". I really wanted to know how the hair in arms and legs can know when to stop growing considering they start growing so fast after being shaved.
FetchQuestAssigner4423 (1 год назад)
Dat close up!
Alexa Bella Muerte (1 год назад)
Rage Coder (1 год назад)
I thought they don't stop growing
adeQuate (1 год назад)
Then why do how do they know when to grow and how long when cut, it they are not connected?
SugarCofee (1 год назад)
''try explaining that to a 3yo'' hahahahahahhahahahahahhahahahahahahhaha
michael (1 год назад)
Why does women grow longer hair and more straight than men?
Jognt (9 месяцев назад)
Because they don't. Men just cut it more frequently. Regarding curliness/straightness, the longer a hair becomes, the less likely it is to have significant curls. That's just gravity doing its thing.
Lolly Lemur (1 год назад)
1:01 Me at that age though
runnerJong (1 год назад)
why do some people grow pubic hair on their faces?
krishnaa balaji (1 год назад)
So this is why some people grow beards like more than a few inches, but some can't grow it longer than an inch or so?
sumedh deshpande (1 год назад)
Can you make a video on how hair loss serums and tablets work?
Mateolevic (1 год назад)
Intelligent design. Amen.
candlewax122 (1 год назад)
Okay, but how do I *stop* anagen?
Mike Altieri (1 год назад)
So basically you have NO IDEA why hair stop growing, click bait much?! This is supposed to be a science channel not a "we really don't know, we're just baiting to keep our numbers up"
Hana Silitonga (1 год назад)
So what about when you shave or cut your hair? Is it true that your hair will grow faster when you shave or cut your hair more often?
CeeJay Nor-Val (1 год назад)
I'm only 12 years old but I had a very long hair on legs
Julia George (1 год назад)
😩i will start form know we will going to see what is going to happen 🤔
starchild (1 год назад)
I think if you let your hair grow out as much as it can and just leave it be and not cut it your body will use the extra growth hormone or whatever that is not being used since ur hair has grown to its full potential for other things like repair other stuff muscles groups etc.. I dont know just a theory.
castleinlondon (1 год назад)
Keratin-o-cytes. Because they hold large amounts of keratin protein. Not kera-atin-cyte....
qthoshi (1 год назад)
Why do older men start growing longer eyebrow hairs, nose hairs and hair in their ears?
UriYah Ysrayl (1 год назад)
Answer: God
Jay-Rock (1 год назад)
I want my hair back please giving me a solution without that Bosley surgery.
_*My Cork*_ (1 год назад)
How can we kill *keratinocytes* on our body without _laser treatment?_
ram Bhagat (1 год назад)
why fish haven't hairs😯
Amarilis (1 год назад)
That made me chuckle "tho try explaining that to a 3 yr old" I CAN PICTURE THEM SCREAMING LIKE HELL IN A BARBER CHAIR!!!
Quirk91 (1 год назад)
Could there be a way to somehow keep the follicles dormant indefinitly? Or basically what im wondering is; could shaving pills be possible??? 8D
Stephanie Werst (1 год назад)
What causes it to turn grey?
theapocilip (1 год назад)
Wait a minute. In another video you said humans are the only animal who's hair will never stop growing on its own and that's why people can have extreamly long hair and animals can't.
rohit kumar (1 год назад)
8 months now my hair is growing
The Illusion (1 год назад)
why does everyones hair to grow at different rates and how do you gets yours to grow longer?
JungkBun (1 год назад)
My eyebrows grow very fast like no joke
Kaisli Rajamäki (1 год назад)
Why does hair change color from time to time? A hair strand can have different color through out its length.
Juubes (1 год назад)
Oh no little it doesn't hurt at all! Your hair is dead. WHAAAAAT I GOT DEAD HAIR IN MY HEADDDD?!!!! GET IT OOOOOUUUT!
A0nZ GoldY (1 год назад)
1.25cm a month?? Thats it! My hair grows 1/2 an inch every week and a half
hajeraa (1 год назад)
My eyebrows grow faster than my hair... -_-
gentlebrit (1 год назад)
Still don't understand how the hair on my legs knows it's been shaven for it to start growing straight away, the hair didn't fall out naturally so how does it know? I get the part it knows when to stop.
Ernesto Estrada (1 год назад)
My hair grows around an inch each month.
Puneet shailly (1 год назад)
shave has maken my hair thicker
sun j shrestha (1 год назад)
i have hair on my lower part of my body how to control it
Brandon Rankin (1 год назад)
you say 1.25 cm a month meanwhile I'm a dude who's hair goes from Practically bald to below his shoulders in a month so I'm not so sure that fact is true XD
R Shannon (1 год назад)
1.25 cm a month?! my hair doesn't even grow till my bra strap... HOW can I make my anagen faze longer???
Cassie Ang (1 год назад)
wait my eyebrow NEVER drops.......
html1998 (1 год назад)
"the visible part of the hair is entirely dead"... so i wonder how they get "damaged" when bleaching or when you dye it
BKaten (1 год назад)
lol pause at 2:32

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