How Humans Lost Their Fur
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- Опубликовано: 5 май 2024
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We’re the only primate without a coat of thick fur. It turns out that this small change in our appearance has had huge consequences for our ability to regulate our body temperature, and ultimately, it helped shape the evolution of our entire lineage.
Thank you to Julio Lacerda ( / juliotheartist ) for the excellent Australopithecus and persistence hunting Homo erectus illustrations!
Produced in collaboration with PBS Digital Studios: / pbsdigitalstudios
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References: docs.google.com/document/d/1l... 
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I'm not going bald, I'm evolving.
I never though to look at losing my hair in that light. Now, I don't feel so badly about being bald.
😂😁😂😁😂😁
I always thought it was weird how we have alot of hair ontop of our head
My art teacher is bald. He had evolved way too far beyond
God only made so many perfect heads. On the rest, he put hair. 😉 😊
your right
Human persistent hunting is literally the stuff nightmares. tall thin creatures slowly chasing you forever until you die. you can outrun them for now, but they’re still coming and there’s nothing you can do to stop them.
🤣🤣🤣
And on top of them planning they might even start throwing things at you when you stop moving.
@@Austin-cn8vh Sharp things.
It follows 😳
Ah, middle school
The fact we opted for the weirdo “I’ll keep running and running and running” hunting method is so funny to me.
A man who lived with a tribe in the Amazon or something, said they ran for 5 hours and the tribe only stopped for a handful of muddy water, then kept running. Literal machines & all extremely physically fit
I saw Joe Rogan interviewing David Choe and he told that story when he travelled to look for dinossaurs.
How easily we forget what wonders our bodies are capable of.
@@sirreginaldfishingtonxvii6149 we aren't forgetting we just never get the chance to experience it. Because a lot of us would die doing so.
@@eliezeretecap Joe Rogan is an idiot masquerading as a genius. The laughable part is that some people buy it, and they are making him a fortune.
You seen thaton joe rogan
You know when you look at a sphinx cat and say, “oh my god what happened to that cat?!?”, that’s what other apes think when they look at us.
Okay this brought a chuckle in me 😂
That’s exactly what I thought while watching the video and then came down to find your comment 😃
"Fellow ape, what happened to all your fur?"
😁😁👍👍
I thought about hairless animals too lol some people think they’re so ugly…we’ll sorry buddy you’re one of them 😂😂😂 I think hairless animals are adorable!!!
When do paleoanthropologists think Homo Erectus first evolved the ability to conceal its genitalia via clever camera angles and obstructing props?
omg SKSKSKSK I just noticed them
Enquiring minds want to know!
Probably when they became Erectus and embarrassed in public for the eternity.
Do you think the Erectus bit relates to their stance?
not to mention their buff bods. They must seriously work out.
Jane Goodall also suggested that we spent time in water, another way to cool down, which also caused most other mammals to go hairless. As it happens, prime apes today will always walk bipedally in water which could point to how we began to walk bipedally more often as well.
Well i rekon they would have drowned if they didn’t stand up in the water😊
with no proof at all. completely assumptious, and a figment of her imagination.
@@rimrejectsand that is how theories begin. Many other anthropologists believe we lost hair by swimming and considering our beginnings next to the sea, it makes a lot of sense. In fact, it makes more sense than jogging it off. We evolved in the Rift Valley with mountains, rivers, streams and ocean, rather than open plains.
@@BBMc107 where’s the evidence for humans, or any species for that matter, evolving into a completely different kind. It’s all narrative.
Don’t think it was Jane Goodall, was Elaine Morgan and a theory called The Aquatic Ape. David Attenborough did a documentary on it years ago, very interesting and talks about the water giving us ‘blubber’.
I probably come to this realization after every Eons video, but it’s simply stunning how much we know about life, history, and our planet. So much of this was unknown just a few decades - and definitely a few centuries - ago. We have come to know so much, the last remaining questions are things like, where did the entire cosmos come from. And in a sense we do have decent, if incomplete, answers at that.
And now I’m absorbing an overview of a few million years of evolution on my handheld supercomputer in my climate controlled bedroom. The power of science to enlighten and improve the human way of life is without compare.
*Word of advice...* Don't store too much of it. The info will be changing in a few years. Trust me.
Ah my bed is where I spend much time with my phone.
@@Britton_Thompson It does change. Progress and the accumulation of knowledge is not a straight line up. It zigs and zags. But if you look at any decent time interval, say twenty years or so, you can easily see that overall our knowledge is moving upward. What we do with it is another thing. Some people, of course, will take the opportunity of a zig or zag to assert that science is and experts are unreilable and worthless, that any old person can use their common sense to know what is what. Well, pretty much all of medical science, for one example, disproves that notion. Which is why we go to an oncologist if we have cancer. Disregard their advice at your own ignorant risk.
Pretty sure we're entering the next stage of evolution in the coming decade. Artificial intelligence. It's going to take over sooner or later. So much for all that running in the savannah. 😅
you think science is going to tell you where the entire cosmos came from..?
*Tier Zoo:* Human sweating is OP.
Well,it is
Indeed
Highly based, very pog.
I’m sweating rn! Lol
this would've been a perfect topic for a collab :p
"What did 500 million years of evolution lead to?"
"Naked sweaty men"
😂👍🏼
Sounds great, honestly
Mmm😋
Jk😂
Water cooled xD
18 of them too...
This is one of my favorite Eons episodes. All of the human evolution ones are. I've always thought: we're such a unique mammal! We're the only mammal that stands on two legs, the only mammal without fur, blubber, or any other thick insulative substance, and so on. These videos explain them in a clear and concise(as well as fun) way, and I love them!
We’re not the only mammal without fur. First, we do have some fur, just not as much as most mammals. Second, there are many examples of other mammals that don’t have much hair, some which have less than us in fact. Elephants, rhinos, hippos, whales, aardvarks, I could go on. There’s plenty of examples of mammals that are relatively hairless.
Well.. some of us still have blubber :D
Major props for clarifying your use of the word “we“ I wish more people would. The most carelessly bandied-about word in the English language- in any language.
Title: How humans lost their fur
Me looking at my belly: They know nothing, my friend.
we still have it. its just not as thick as before
@@judas1523 You sure about that?
As a full blown Latino i know about body fur...
In some avenues of the variations of the Homo-erectus species, some Neanderthal genetics are still prevalent
@@jonnyrocket3659 True. However, that doesn't mean high levels of body hair are always caused by Neanderthal genes. If humans lost body hair due to natural selection, then we can assume some humans had more hair than others. It's possible that once a certain point was reached, more or less hair didn't make enough of a difference, so those genes passed on. It's also possible that when humans started wearing more clothing, the selection pressure against hair was reduced, also allowing those genes to pass on. Thus, whether or not a person has lots of body hair might not be based on their Neanderthal heritage.
That is some very strategic gazelle ear placement.
Relevant username?
And antler placement!
That's evolution for you.
@@horseenthusiast1250 well the antler is part of the gazelle
It's an Nyala, they are way bigger than Gazelles and have different colouring
This is most likely how we were able to hunt very large and powerful animals without suffering constant losses. Just need enough hunters, possibly using torches, to scare them enough to make them want to run rather than fight. In time, they were so exhausted they could not run or even defend themselves, allowing for an easy and safe kill.
the loss of fur for sweating is more beneficial in terms of releasing heat but also cooling during that process. evaporative cooling really does work, you ever sweat a bunch then transition to a place where you’re not sweating anymore and feel super cold. when our ancestors finally sat down under a tree after running after a deer for 5 hours, i’m sure their sweat drying up felt like AC on a summer day. another analogy that can be used to demonstrate this is when you rub alcohol on your skin it feels super cold and dries up quick, this is because alcohol evaporates almost immediately from your skin and you’re feeling the cooling effects of evaporation
Yeah, anti-perspirants are a double-edged sword, especially without AC.
I was a nurse for almost 40 years. I've seen a lot of naked people and I've got to tell you some people still have " fur".
I worked with a guy that seem to have more hair than body. He always joked about it. I sort of felt sorry for him. He was a great guy with an awesome personality.
@@MG-mj6zi I also feel sorry for great guys with awesome personalities.
@@abebuckingham8198 Why!
@@MG-mj6zi You don't know? I mean, you said it first.
I see you are not one of them. You rather poke fun than to honestly help a person out. Thanks for the cue though...
Persistence hunting today:
**Drive to 17 different retail outlets looking for a PS5.**
Check Facebook market
@@ironman332 Nope. Not buying from scalpers.
My mother did that for Beenie Babies.😆
@@ironman332 hehehe i have met 30+ fake ps5 seller now. I dont think its a good idea
The hunt is ON my friend!!!
The fact how they gathered all those informations is absolutely incredible.
I think we overestimate the ancestral ability to hunt. Groups would drive prey into other members of the social group, who'd then drive it further toward exhaustion, etc., more than just three guys running down the gnus of the past. We also probably had some capacity to nest up and cuddle, as many animals still do, when chilled. Sweat, btw, is a hidden blessing. Beats wallowing in mud or living up to th eneck in water like pigs or hippos, respectively!
Hippos can sweat.
They also turn pink when they do it.
bruh just imagine being an animal and being like "phew I lost those humans" and then you just see an army of screaming monkeys with spears charging at you.
Each with the newfangled atlatal, an extension device that doubles the throwing distance.
You thought the silly human gave up. He used communication skills to obtain backup.
Humans are OP in crafting and communication. We've min/maxed fur for brains.
We are designed to throw, and rocks are everywhere. Many villages in Asia throw rocks and use simple slings to hunt, so it's speculated we had tools and probably picked up a 3lb rock to hunt with then use the tools to get the meat, I mean I killed squirrels and birds the same way as a kid in the country. My 2 year old can throw a tennis ball 20 feet with no coordination
@@MadRabbit0wnzu what does that have to do with my comment?
*Tall, naked, sweaty figures running at you appear over the horizon*
@@sboneliberator1977 It has to do with your comment because it extends the case for how dangerous humans have been to animals that they outran, outsmarted, and outthrew.
Persistence hunting is now called a 9 to 5. That’s how humans lose their souls.
Not unemployment?
😄😄😄
Doing what people tell you to do even though you don’t agree with it. Crushes the spirit, that does.
Persistent hunting... you mean more than 3 minutes?? XD
Persistent hunting is when you get a call from an insurance sales rep.
Fascinating as always. Just hearing how we adapted to our surroundings over millions of years and then finally destroying ourselves and the environment in a relatively short years is breathtakingly stupid.
I know, really? Somehow getting exponentially smarter about the world around us made us blind to constructing an existentially disastrous way of life in that world. The irony.
I look at my chest and back every now and again, and come to the conclusion that humans have definitely NOT lost their fur.
They mean a thinner layer of fur. Even with very hairy humans, they have thinner hair in comparison to a bear or dog or smth.
So if hair is fur, does this technically mean my beard is a luxurious mane?
Yes
Yes
Yes
Yes
Only if it's luxurious
Having once had the experience of being unable to sweat for a period of several months, I can say with certainty that sweating is a deeply underrated human ability. You may think sweating is gross or inconvenient, but it's a whole lot better than not sweating!
Truth. Our daughter has to take an antiepilectic medication as a toddler that has the unfortunate side effect of suppressing your ability to sweat. That was the most stressful summer ever! We had to be so careful how hot she got! Fortunately, we failed that med and moved into another. It took years for her to fully recover her ability to sweat!
@@jolenethiessen357 ...I would probably freak, and just constantly spray myself with water if I lost the ability to sweat.
This isn't really the same, but one time I lost my voice from screaming too much the night before, and it was absolutely awful not being able to join in conversations and having to keep everything I want to say in my head. It's like I didn't even exist :(
@@jolenethiessen357 ...Out of curiosity, was that antiepilectic medication called Tryleptol? Because I took that as a kid as well, and that got frightening and frustrating in elementary school. Recess in a Texas summer is hell on its own, but not being able to sweat and with minimal shade on the playground was actually straight up dangerous for me. Not that the school cared. No amount of my parents trying to convince teachers to let me stay inside and read ever worked. I'm genuinely lucky I didn't die of a heat stroke.
I sweat very little, and indeed, overheating is a problem.
Great editing. I never knew you could tell that much information with the same three stock images of homo erectus taking down a gazelle with their bare hands and sweat glands.
Thank you for downloading excellent job on this video PBS did wonderful?
As an Australian entering summer, I sure am glad I have 2-5 million sweat glands right now. My clothes might beg to differ though
So gealous, here in Italy its like 15C during day time :(
It's winter in the rest of the not upside down world
@@Lumberjack_king yes I own a television and the internet. Our media has also been consumed with white christmasses our whole lives so we get it :) trust me. Meanwhile I’m sitting with my feet in an ice bath to cool down.
I am sure americans will ask why is it summer in australia
@@brunoventina7619 summerheat, its below 0 here since last month. Will last til about march
3:24 "This has made a lot of people very angry and has been widely regarded as a bad move"
nice hitchhiker's guide to the galaxy reference :)
Return to monke
@@pimd6998 mmm
Many solutions were suggested for this problem, but most of these were largely concerned with the movement of small green pieces of paper, which was odd because on the whole it wasn't the small green pieces of paper that were unhappy.
RIP Douglas Adams, my son and I have you fondly in our thoughts, we are currently listening to the original radio plays.
I truly enjoy this channel and learning more about evolution. Please consider creating one that’s targeted to elementary school students.
I always wondered about this. Thanks for quenching my curiosity.
10:57 "having hair on our heads …"
*A lot of Men over 40:* [sad noises].
Peach fuzz.
Cave men wouldn't live past 40 so it doesn't matter to them
You could argue that bold men are taking this evolutionary trait one step further... maybe more evolved even 🤣
Cries in 17 with receding hairline.
cancer patients: [sad noises]
One very critical aspect of having hairless skin is that you then can have tattoos, which are important for coolness (though not thermal coolness).
No, but coolness is important to survival, I have a coverage of 2% coolness from tattoos.
gotta wonder if black tattoos get hotter, brb gotta stand under the sun.
and injecting metals and other unknown substances into your body
@@toppermost66 water under the bridge, my friend. water under the bridge.
I have none. I want to stand out and not be like everyone else.
10:00 "we average about 1 liter per hour" talking about sweat loss. Hell no we don't. No human is drinking 24 liters of water per day.
I've been thinking about this the last couple of months.
So it's an interesting theory about the sweat, I also hear that if we hadn't "lost our fur" it may have effected the intellegence we've developed as we have found many other ways since losing the fur for compensating for this.
So losing the fur is one problem.
The other one I have is that, okay, we've lost our protective fur, but why is the skin we have been left with, so weak and easily damaged, and overly sensitive? We don't even heal from this damage particularly quickly or have decent immune resistence to the contaminants we get in damaged skin. Our skin is so weak, it can be cut or damaged on anything, forget preditors. Actually, forget predators, our skin can't even handle insects.
And the crazy part is, we're the only animal that has developed in this nonsensical way.
"They couldn't have survived being hairless at night" she says as I sit in my badly insulated room in a basement in the Midwest *in December.* Now, if you will excuse me, I'm going back to sitting closer to my space heater than is recommended.
Ahhhhhh... toasty... 😊
What's a heaters???
@@rubyamateurtactician4354 Molto Bene!
@@charlesroberts3650 uh... no hablo le French?
I live in Phoenix. It was 99degrees last month. Hopefully December doesn't get that hot or we'll be having Christmas in the heat, like Australians. :P
Next deer season I’m leaving the rifle at home and just chasing them around until they collapse of exhaustion
Ok. I suggest you start ultra running training program before doing that. 99.999 % of modern people live too soft life to hunt like that.
@Michael Miner Feel cold? Run harder. 😉👍
@@rickrandom6734 nice, I’ll look into using my rifle
I'm afraid it won't be the prey collapsing of exhaustion
My grandmothers brothers would do this. They would run hours through the jungle running after deer, which is pretty metal.
Fascinating answers to Fascinating questions I've never thought to ask.
I really enjoyed this and I like the direction that the hypothesis is going. I’m still curious about how we were then able to keep warm enough at night. Fire was still a long way off. You are right about the importance of sweating. I have a sodium/potassium imbalance and so I hardly sweat at all, which means that I do a fair amount of fainting in warm weather. Fortunately, I did not pass it on to any of our children. :-)
I imagine they used animal skins and fur, and maybe collected grass/hay, along with various kinds of shelters.
the person who counted all the sweat glands were def doing it for their phd
Imagine all the knowledge we wouldn't have if it weren't for poor, underpaid, overworked grad student grunts
@Phil Weatherley Personally? Nothing. I was in Comp Lit :P But I commiserate with my colleagues over in the sciences!
It’s what people do when they are madly in love🤣
getting a phd is persistence hunting
"Trust me bro I'm doing it for science it's not like I have a fetish or anything"
I dunno. I've been to water parks. There's still a lot of humans out here with a thick covering of fur........
I am one of those humans
@PewPewZee LawL the hell r u talkin about?
She forgot to mention beard hair and why it still exists she only talked about head,armpit and pubic hair I think she forgot beards exist
@@user-xg3un6pl5j facial hair looks cool... duh
Dawn of the Planet of the Apes?
i knew a kid who couldn’t sweat back in elementary school and i didn’t really think about that must’ve genuinely affected him. imagine being in 1st grade and having to stop every 5 minutes on a hot day because you don’t make that smelly, sticky skin water
Excelent, and with your voice it sound easy to comprehend.
Humans: Lost fur
Also human: Is cold other animals give me your *SKIN*
*This is an unbalanced patch*
Tierzoo has entered the chat
The ability to put clothing on and off their bodies is one of the most important traits that lets humans adapt to any climate in the world. The devs thought this is the best way to narrow down humans' roles but it was an unforeseen buff that expanded human builds that can excel in multiple servers.
@@MrH2O1998 i read that update patch with his voice.
survive, adapt, overcome
People only got cold after leaving Africa, so... that came later.
"our species is exceptional at persistence hunting"
And yet I tire after 1 minute of running lol
LOLOL the SAD truth
Probably because we lack training. If we practice running for longer periods of time, I think our body would adapt and make us have longer endurance.
But in a real situation, like hunting down animals, you would have so much adrenaline in your blood that you would be able to run much faster and much longer
Technically you don't even necessarily have to keep up a run to do persistence hunting, so long as you are able to keep tracking your prey and keep it running from you enough to tire it out.
@@keelanc1681 Yes good thing our species dominated the food chain.
I'm really curious about the Austrolopythecus calorie counting conclusion, could you link the source of that research so I can understand it better?
The Aquatic Ape theory is stronger.
Me looking at my back in the mirror: We lost our fur?
Most of it
Haha
You are very slow in evolving, most of us lost the back hair
@@q8ubermensch224 no
We going back to our roots homie! These hairless apes forgot where they came from.
"Hey, you know those skin pigment adaptations to intense sunlight?"
"Yeah?"
"Let's fight over that for most of our species' history!"
"Okay."
Love this dark joke🤣🤣🤣
This.
Actually nobody cared until colonization of Europeans began like 500 years ago.
Lollllll😂😂😂😂😂
@@fenrirgg I'm pretty sure all the way back in the BC's there was discrimination based on many things; tho, skin color may not have been a direct thing people were discriminated for, different cultures and regions were discriminated against and different cultures can have consistently different skin colors, so you can see how this was always, kind of, a natural extension of discrimination. Now if we can only get rid of all the discrimination, the world would be a better place.
Proof that the term:
"Sweaty try hard" is actual a compliment/term of endearment lol
Strangely enough, woodhog has 3 hairs in one drill, but they can't sweat. So it's the habit to lay-in mud-pool to cool-down.
Panting: air cooled, low heat dissipation, inefficient
Sweating: water cooled, high heat dissipation, high performance, energy efficient, significant boost in processing power
Phase change cooling
In short, humans can recover stamina faster than any mammal on the planet.
You are mistaken. Both are phase change cooling. The difference between both is the area where the phase change occurs.
@@DanDanJanJanJP This.
@@prestigev6131 no, some dogs are between , but they are few breads.
Babies have fur in the womb called Lanugo. It's usually shed by the time they're born but some babies are still covered in it at birth.
@Snappy Ape power snack
ewww.
This is true
i had that all over my back! :D
*barf*
We still have a little bit of fur. It just very thin and called hair now. Or at least most people have a thin layer of peach fuzz. Some people also have very thick hair. Once in a while you see people who are covered with hair due to a genetic condition too. But that is rare these days.
Watched all of it , just amazing and edifying
_"Fur and hair are the same thing."_
So tigers are gingers?
Morris!
Just like orangutans
They have no soul.
@@epauletshark3793 I-
Tigers have no souls or gingers have no souls?
@@alex-fs9yt gingers have no soul. If tigers are gingers, they have no souls.
Ah, such a cleverly placed antelope ear.
All the better to hear you with.
Don’t forget the antler
3:49 Read this comment just at the right time. Made it twice as funny.
When you said "Only humans can do persistence hunting" you are also ignoring the main reason why Humans domesticated wolves. Both the ancestors of Humans and Canis lupus were persistence hunters, Our ancestors saw potential in the wolves to make it easier for both species to co-exist and share resources.
Why haven't wolves developed sweating and loss of fur ?
For some reason this video has been in my queue for years and I never watched it. It was great like always with Eons, but now I'm curious... How did Homo Erectus or other sweaty early hominids deal with water intake and salt intake?
The fact that we lost our fur and then started using the skins of dead animals as a substitute is absolutely *brutal*
Nature itself is brutal and we are a part of it.
It's awesome. Hey, can I borrow your skin
Some call this, 'a pro gamer move'
Fur has its uses. It’s just nice to be able to take it off sometimes.
We woke up and chose ✨violence✨
So basically because we got a cpu upgrade, we needed to upgrade our cooling system to prevent from over heating nice
Like the PS5.....oh wait (....console starts shutting Down due to high temperatures. ...🥵😒)
Lol
Nope, wrong. We upgraded our cooling system which allowed us more wattage, the increase in wattage (energy/food) allowed us to increase our CPU.
exactly my nerd boi
Excellent...never even thought about this before.
I can’t believe you have photos of the first humans running.🤯
The more I learn about our ancestors, the more I respect the abilities of Homo Erectus. Seems like a tough survivor, and succesful preditor.
Home Erectus will probably end up having a longer tenure than "the wise ape"
@@coolworxyeah definitely, it hasn’t even been 15,00 years since civilization started and we’ve already begun destroying the planet
Definitely a stand-up guy 👍
@@mrcool7140 Saw what you did there 😁
A Homo Erectus child would likely wipe the floor with an average Homo Sapiens adult.
WHERE IS STEVE?!?!?! WHAT HAPPENED TO STEVE, AND WHY AREN´T WE THANKING HIM?!
Sadly he stopped being a patreon u.u
They mentioned a while back that Steve was regretfully no longer able to financially support the channel. I miss Steve
He was like a brother to me
we miss you steve 🥺
RIP Steve you'll be missed.
very awesome explanation of human evolution. 💕
thank you. 🤗
friendship ended with fur, now sweat is my best friend
I always thought humans lost their fur in a nasty divorce battle when we left the monkeys.
Hahahhsh this was the best comment
Damn monkeys! They took our fur and our ability to swing through trees.
@@TimDyck we can still do both
@@cursedlemon7368 badly.
@@AspireGMD lol bad on both
One of my favourite things about ancient human science drawings is the “potted plant” in front of males
Or the “antelope ear”.
Or fact that there are practicly no females
@@ImieNazwiskoOK a common male sentiment.
@@ImieNazwiskoOK of course. That requires more strategic placed objects, which weren't as plentiful in that era.
What about the image at 3:03 ?
long distance running is the most overpowered hax we have 😂😂
Great episode!! Good chuckles too.
I am 55. I am so happy to know I am not getting older I am just rapidly evolving.
I'm guessing it's your head only. High five, fellow evolved hooman!
I think im devolving
Yeah well my hair is falling off my head and settling on other parts of my body.
I’m not going bald I’m just redistributing my hair
@@neilchapman5145 I presume they are moving downwards? It's called gravity buddy
More like retroactively decaying. We start active process of dying the moment we pop out the womb.
Just something else to point out -
(Warning: kinda gross)
We can also tell when we lost our hair by studying our lice. The closest relatives of head lice is chimpanzee lice, and they seem to have split the same time we and chimps did.
But PUBIC lice, on the other hand, share an ancestor with gorilla lice, and seem to have diverged only 3 million years. Considering that they should have been outcompeted by the lice we already had, that indicates that by this point, hair was already reduced to a few areas on the body, allowing both species to live on us.
Bit awkward, though...
This is both the best and the grossest comment!
Interesting, who knew lice could be the grossest evolutionary time stamp ever.
that is actually super interesting, now I want to watch a Eons video about body lice.
And with the advent of... "landscaping", pubic lice are less common.
Pubic lice are from gorillas ... I think there is a question in that statement best left open.
I'm unaware if the paper about Australopithecus heat loss did the same. It is reasonable to suppose these creatures had methods for avoiding heat loss; two obvious ones are: a) covering with something at night, be it hay, dried leaves, animal hides or whatever; and, perhaps most obvious, b) sleeping in communal groups, this would greatly reduce net heat loss for individuals. In combination these could mean this species lost its hair much earlier than is supposed.
And yes I think you were spot on on pigmentation admination. Directly linked to descendants. Ancestories location on the planet
Science: sweating has made us what we are today
Scientist: "gross"
Kallie clearly has mixed feelings about sweating.
Embaressing
The fact that it used to help is, doesn't mean that it does help us today
And the fact that it does not and is a liquid full of bacteria is gross
@@alezar2035 Go for a proper run and you ll realize how important that is.
And there is quite a difference between sweating into occlusive clothing than sweating to reduce your temperature.
@@alezar2035 Try working in a +40C climate and then say sweating doesn't help.
"humans don't have a thick coat of fur" hangs my head in shame. Guess that confirms it I'm not human
@@Yigash (makes chewbacca noises in response)
so many men have "pelts"
I think you're confusing that with your sweater
Don't worry bro
Eons have Primitive human fetish
Hey, it's ok to shampoo your back.☺️
5:45 an important note is that you don't necessarily need fire to survive cold nights without fur if you already have pelts, or know to pile loose foliage on top of yourself and share body heat. If they had this 'instinct' of insulating themselves with external objects (maybe even pelts of animals they hunted, or woven mats of grass) then fire is not essential.
"homo erectus hunting 5 hours straight" would be a good youtube video title.
This was very interesting, as Eons always is, but I just wanted to add the hypothesis that pubic hair and armpit also may be an adaptation to help prevent chaffing during physical activity as it helps to prevent the skin in these areas from rubbing against skin.
That and protection in the case of the pubic area. For women at least, pubic hair is a great barrier-almost like eyebrows-that catches things to stop possible infection
Also, armpit hair is like a built-in evaporative cooler in each armpit.
True.
I concur
So are you saying we shouldn't be doing lazer Brazilian's?
What I learned from this video: Kallie really thinks sweat is gross. Really.
Seriously, I loved this video. Fascinating topic.
Methinks the lady doth protest too much, perhaps she’s deflecting her fetish?
(Sarcasm)
Only a desperate girl can say shyt like "Sweating was a huge perk for humans: It allowed us to out run and hunt animals like lions, leopards, cheetahs, bears. BUT SWEATING IS SO YUK! Hahahehe... :( Does anybody like me now? ;( " No... we can still see your face
@@MarkdjRace you alright there? Bullied because of hyperhidrosis?
@@Gothic_Analogue Instead of being sooo "grossed out" by one of most important human adaptation (in science video btw) maybe you could just find another way to feel included. Maybe to tell appeal to children to actually sweat once in a while - fight that obesity epidemic among your nation. Showing off with ignorance is wrong way to feel included. What do I know... roll on then.
@@MarkdjRace I don’t recall the part where I eluded to being grossed out by water and oil being secreted out of a flesh crease.
And we are fighting the obesity epidemic in the UK, by ensuring all the kids that need free school meals don’t get them. Duh!
EDIT: wait, did you think I was a US citizen? Ahahahahhaha. You’re funny.
we never engaged in persistence hunting . we specialized in snatch and grab/raiding/patrolling behaviors . we most probably engaged our prey from safe points like the tree line , rocky outcrops, bushes . we got so good at it that over time we had to go on bigger and bigger patrols . "persistence hunting" is dead , it was patrolling/raiding behavior that completed the transition to full bipedalism . it makes far more sense when you think about how it all transitioned into modern behavior , monolithic building , battle tactics , settlement , exodus , tool use
How would you know that, were you there to witness all this?
But we run so damn slow. I thought most animals were so much faster that they would’ve been long out of sight before tiring out
I'm starting to realize how unfit almost everyone is lol
We actually are. We're great long distance runners. We just have to exercise to see those results, which are seriously impressive. There's a tribe in Mexico that does long distance running, and it's insane how far they can go.
@@justinstewart4889 I remember history with Greece with that one guy who marathon none stop just to deliver the message I forgot what is then he died afterwards.
Losing muscle mass and slowing metabolism is also a very important adaptation that allows humans to need fewer calories and thus have to eat less food. Otherwise, in times when less food is available, those energetic muscular humans would die quickly. There are modern day people with rare mutations that show this.
@@KWifler except for obese ones though 😅
@@pauloazuela8488 i think you are talking about the greek guy named ...Marathon. Its named after him, and he ran 42 km before dying, the same length a marathon has :)
Edit: I was wrong, it Marathon was the city he was running to
tl;dr: humans went to the top of the food chain by becoming sweaty tryhards
We literally become sweaty tryhards...
“Tryhards” is my new favorite word
omg we're all sweats
We literally sprinted during the warmup lap in gym class
Go vegan we’re not part of the food chain anymore (from a wildlife biologist)
Humans are definitely oddballs. Although there is also definitely a lot of diversity amongst primates, a lemur is very different from a gorilla. But humans definitely evolved in a particularly weird way.
*Upgrade Sweat?*
Upgrade to sweat: “you may now run for a extra 5 hours”
So the next question to be answered is, "When did human hair become migratory?" All that scalp hair keeps moving to ears, back, etc...
I don't know any specific research on male pattern baldness, but i imagine it's one of evolution's unintended casualties.
MPB can at least partially be explained by head shape, which cuts off elasticity to the scalp, causing the follicles to encrust. Having a larger brain, could explain the change in head shape, and may explain why it was never selectively eliminated by females.
You guys are missing the fun in characterizing the condition as "migratory" hair.
...nostrils...
It makes you more streamlined and aerodynamic.
"Human beings don't have fur..."
Lady, you haven't seen my uncle...
@Cat Egorical A small price to pay for going back to monkey
☝🏼 Ahh... But can he climb a tree like nobody's business?? Hmmm?? 😁
ah your Monkeys Uncle and yes that's a refence to a Zoo animal movie
One other way to understand this is to look at the origin and development of human lice and in particular pubic lice.
Research suggests that humans acquired pubic lice from gorillas around 3.3 million years ago, which may indicate when humans began to lose body hair as they moved from trees to the savannah.
Wait sweat on the hands and feet evolved for grip? That seems counterintuitive sweat makes my hands and feet slip
"Humans have thin hairs called Velllus hairs." Looks at body. No, they aren't fine at all.
vellus hairs you mean
@@imarchello yes.
Compared to other apes? Our body hair is very fine/short. You may just be particularly wooly. ;)
@@LayneBenofsky We try to pose as modern humans by calling ourselves hirsute.
No, fine just means the hairs are kinda alright
Imagine chilling in the savannah and suddenly some weird looking trees start chasing you for hours
I laughed harder at this than I should have and I'm okay with that.
Thanks for an informative video
"You can't do that" well neither I can't persistence hunt or run but we both have the potential to do so. It's amazing that we live in such times that this skill has become obsolete. Well, unless you're hunting the bus :P
Our Apocrine glands also serve the function of scent-recognition. We on a subconscious level store the memory of each other via our individual scent. Mothers of newborns produce a particular body scent that infants use to bond, and research has shown mothers and babies can identify clothing worn by one another from a collection worn by different individuals. Close couples can also recognize each other’s scent from clothing in a blind test. Splendid video as always. Many many thanks indeed.
When I was in school we used uniforms, so all our clothing were the same, but I swear that I could tell which sweater belong to each of my friends because each of them have a particular scent
@@pvallesol I can tell who's been shitting in the toilet at my company by the smell. It's a curse I tell you
@@Rig0r_M0rtis wow 💀
Speak for yourself, I have a thick luxurious coat.
Me too brother. Me too.
That's not fair! You're a bear!
According to the sagas, you and I have what's called "troll's blood" coursing through our veins.
I have hairs growing out of my knuckles, which I remember being teased about two decades ago in elementary school. Hairs on your knuckles means you're a crazy person, according to my classmates at the time.
@Bad Horse My family genealogy goes back to the 700s. Pre Clovis. Yeah, there's definitely Neanderthal/troll blood mixed in. I pretty much have snow shoes for feet, so yeah, whatever you want to call them, Yeti or Neanderthal genes, I have em
Would like to here more about (Homo habilis and) the adaptation to a life in water. The elefants ancestors were aquatic. I think ours were too.
Interestingly, I also saw today how Chimps are born hairy with light color faces while young, while their cousin Bonobo babies are quite hairless and dark skinned.
They live in different environments.