Why Are We Warm-Blooded?

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A human with the metabolism of a hummingbird would need to eat about 80,000 calories a day to survive. That’s because staying warm by making your own heat takes a ton of energy. And that brings up a paradox, because creating your own body heat is incredibly expensive. The largest animals on Earth have to spend most of their day just eating enough to keep their heat engines running. So why aren’t we cold-blooded… like crocodiles? Here’s the science
References: sites.google.com/view/warm-bl...
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[@Jjjj-ue6wq]

"Being this hot is hard work" I can relate

[@dracothewarrior4316]

Lizard brain cannot compute

[@gabor6259]

I can't. ¯\_(ツ)_/¯

[@thanalincoln]

@@Jjjj-ue6wq cool

[@melissawiekharvey5037]

mood

[@sussyboi1199]

Cringe

[@premnaren8675]

Warm blooded animals- I'm chilly! *shivers* Cold blooded animals- I'm chilly *goes into a temporary coma*

[@stefanostokatlidis4861]

Don’t forget that cold-blooded animals have the advantage of operating in a much wider breadth of temperatures compared to warm-blood ones. It is very probable that at the temperature where a warm blood could start having health problems, a cold but would be slower but still fine.

[@spindash64]

@@stefanostokatlidis4861 That’s larger out of necessity rather than anything else: they NEED to be flexible because they can’t control their internal temperate independently. I’d assume the tradeoff is that the proteins and enzymes they use can’t be as fine tuned and efficient as ones tuned for 1 temperature.

[@Jjjj-ue6wq]

I wished I was cold blooded

[@spindash64]

@@Jjjj-ue6wq But then you’d be even fatter In case it wasn’t obvious, that was a joke

[@jimmytaco6738]

"Why do we do it?" --Joe ...

[@erikziak1249]

I guess Shrewdinger is both cold blooded and warm blooded when you do not look at it.

[@foxgaming76yt24]

Lmao

[@deangipartovi5852]

underrated comment

[@lforest5836]

The way this comment made me laugh i- 💀

[@satansujay]

It's probably just his cat though

[@seancurtis8599]

Lmfao

[@OverlordMaggie]

I'm glad it was addressed in the subtitles - for those who don't use them, being so warm can also impede infections, hence how we fever when we're sick or go hot locally when we have an infected wound! Fungi in particular pise a huge problem to reptiles and amphibians, so a theory is that being so warm helped birds and mammals suffer fewer fungal infections.

[@slevinchannel7589]

Sorry for the long comment and sorry there is no Miracle-Hyper-Super-Solution, but hey, its cost-free and totally-your-own-time-schedule, as well as just plain fun, so i hope such Package is good enough for you. ‚Smart’ is in this channels name, after all, so i hope you at least consider helping KZbin and the Internet... cause it sure as fluff could need the help, tbh...

[@commentor3485]

There is probably a dad in the body that controls the internal temperature and he has to stop people from touching the thermostat.

[@bulldozer8950]

So a fever is just when the dad leaves the house for a bit?

[@anmolmehrotra923]

@@bulldozer8950 precisely

[@frozenweevil4022]

b i o l o g y

[@jimmyverse6783]

@@bulldozer8950 what if he goes out to buy milk and cigarettes?

[@bobachan211]

LMAO

[@klazienanalenveehouderkweker]

I like how the globe being sassy has become a running gag

[@ghost_and_pals_fan]

Yeah, lol.

[@bemascu7087]

I also like how they're using cartoon-Joe much more!

[@kodakincade8063]

I know lolol I’m always looking over at it like waiting for the punchline

[@calebbalzer4518]

10:53 is the one I caught if anyone’s confused

[@crackquack8184]

It's Okay To Be Subtle ;-)

[@davidalfonsoportillomiramo6124]

I just wanted to point out that there's actually around 50 species of lizards that can run on two legs (frilled lizard and bearded dragons to name some popular ones,) this seems to happen because once the lizard reaches top speed, the laws of physics force them into an upright position so they can run faster. Maybe it was worth mentioning though that most lizards can't run and breathe at the same time. Love this channel, keep up the good work!

[@matthewparker9276]

It is also interesting to note that many of the lizards that can run fast enough to get onto 2 legs live in warmer climates.

[@tomlxyz]

Doesn't running on two legs prevent the problem that causes them to not being able to breathe while running on four legs?

[@rodneygoonan1581]

The tree dragon (Jackie lizard) and mountain heath lizard as well as many more of dragons are able to run on 2 legs really fast and also goannas monotremes can run on 2 legs as well

[@ylhajee]

I've heard (I think on Scishow) that body temperature is correlated to how susceptible to fungal infections animals are. So one more advantage of warm-bloodedness may be that you get fewer fungal infections. Do you know how accurate this is?

[@gladiador7370]

Bacterias and virus as well. Fever is a human response to any infection in general and lots of bacterias die after being in 40+ celsius degrees envoirments (but most after 60°C). That's why we also warm water to kill microorganisms.

[@slevinchannel7589]

Hi stranger. I thought this channel's comment-section, if any place, would have smarteristic and smarttastic people. So i wanted to ask your opinion of a Project of mine, trying to help youtube help itself - getting it to become less of what can only be described as 'Messy' without wanting to use hard swearing... Hate, Threats, P0rn, Racism, Sexism, Scam, Spam-Bots, P0rn-Spam-Bots and much more. All of them are non-subtle (some more than others) and therefore easy to find. I used the reportbutton as it was originally intended; not as Cancel-Culture but to help. I mean, the r-button exists. Ist not a Myth. Get what i mean to say? I’m not a big speech-maker, so my comment is obvioussssly lacking; so go on and ask some Questions, as is being smart.

[@jaysabol1821]

Just real quick, I wanna say thank you to this channel and others PBS supports for allowing me to go down rabbit holes like these. The way you encourage education is phenomenal, and i'm glad that one day my kids will have a this channel to watch with me

[@gaminghunt5837]

Education os scarce on some places.but we have it in our pockets.

[@_judge_me_not]

Also Veritasium and VSauce And Arvin Ash

[@varnitpatel3591]

My lord bucket head

[@overlordbrandon]

@@_judge_me_not +Anton Petrov

[@Malaima]

Exactly!

[@corwin32]

8:30 The dino was actually saying, “oh crap, this is going to WRECK the economy”

[@chrishaven1489]

smh. If the T-Rexes agreed to the Mesozoic stimulus bill, they would still be alive today...

[@butterskywalker8785]

@@chrishaven1489 nah,they had horrible economical skills

[@chitsfitss]

Outplayed , u funny

[@EduardoEscarez]

@@chrishaven1489 The Dino government leader: "We are going to a stimulus package as largest as our economists can reach with their arms. Who are our economists?" Dino assistant: "The T-Rexes are our economists!"

[@yellowplate4539]

@@chrishaven1489 Smh those meteor deniers.....

[@mandisaplaylist]

10:20 That wasn't just chance. Endothermy was required to stay alive in the global harsh winter that followed this asteroid crash due to teratons of dust thrown up and covering the Sun (and lasted for decades or even centuries). It is quite possible that this particular event forced the animals which were going towards endothermy to go there while forcing most animals that could not reach endothermy fast enough to go extinct.

[@fredricksfishkeeping3007]

I heard a radiolab episode a long time ago where a scientist they interviewed hypothesized that it actually helped ward off fungal infection during that time too, since there was a lot of decay. Fungi pretty much hate and can't survive at our body temperature, so endothermy was an additional layer of protection.

[@mandisaplaylist]

@@fredricksfishkeeping3007 One of the examples of a mechanism that gave the life a reason to develop endothermy. There could be others. Like the need to be able to control the speed of certain temperature dependent reactions independently of the outside temperature or something entirely else.

[@mandisaplaylist]

@@fredricksfishkeeping3007 And fungi would thrive a lot in the "deep impact winter" that followed the asteroid strike ...

[@minutemansam1214]

I'm surprised he didn't bring up pregnancy possibly being the stepping stone for warm bloodedness. Many reptiles and fish become partly endothermic while they are pregnant, so warm bloodedness could potentially be a trait that is beneficial for organisms that do internal fertilization, instead of external fertilization.

[@vir822]

Fyi crocodile might win the parenting award coz ..a documentary from Attenborough described how gentle they can be while handling babies just hatched ..also they run full day care for other Crocs ...and take care of them

[@spindash64]

This. They’re not as invested of parents as birds or mammals, still, but far more than what people give them credit for

[@surendrasinghbhati6888]

specifically ' Ghariyals' are good parents.

[@Dragrath1]

@@spindash64 Yeah also most gator attacks happen during their breeding season usually because someone got between a mommy gator and her nest and or hatchlings They might not be as hands on at parenting as most mammals and birds but They are quite adept parents in their own right even if they largely stops at protecting her young from predators until they get big enough to fend for themselves.

[@semyonchernykh4694]

Ye and if hungry, they will eat one of their children, to stay alive to protect the rest of the kids

[@fmlAllthetime]

Came here just to say this. Crocodilians are highly intelligent and caring parents. They've been seen damning off water for their young and some species have cooperative parenting, along with parenting for months and in some species up to a year or more. Even further, there's also potentially the first recorded tool use in reptiles, with American alligators using sticks to bait birds. Although this is a one off, there is the story of Pocho the crocodile as well, where he becomes what can only be described as friendly with a human and loyal to its friend. I really dislike this realm of thinking that whatever categories we fall into are the best. Ants, crocodilians, octopuses, squid, and bees are all animals that show highly intelligent and thoughtful behavior that aren't very close on the evolutionary line to us.

[@domc3040]

So if the shrewdinger is the ancestor of all placental mammals, does that mean that technically all cats are... shrewdinger's cat? :D

[@LuisSierra42]

Not good joke

[@nadiaalibaig]

Good one

[@illuminoeye_gaming]

The duality of man

[@ryannayeraini5164]

Lol

[@ryannayeraini5164]

@@LuisSierra42 it is a physic refrense

[@hanifanzak]

6:57 Collared lizard can run on 2 legs too Sailfin dragon and frilled dragon are also able sprint on 2 legs

[@DamienHanma]

I know your comment is 2 years old but I need your help. How could conversion evolution or evolution in general, make those two legged sprinters, the next t-rex? Maybe being in an environment just like the T-Rex was to adapt to it?

[@RennaTempest]

Me getting a Facebook add right after he said “because this happened” makes sense 8:29

[@Spear_of_the_Raven_Ash]

Same thing happened to me!

[@BallsCrusher]

Samee

[@lessoriginal]

"crocodiles aren't exactly winning any parent of the year awards" My guy. You need to do some reading on crocodilians.

[@XalconKugelBlitz]

IKR

[@SolarAbyss]

And lizards, the frlil-necked lizard also runs on two legs

[@nunyabiznes33]

Bruh, many croc moms are better parents than those women that dump their babies on the streets or orphanages.

[@IceniBrave]

Came here to say this. Crocodiles are pretty nice parents.

[@azaki3810]

They wont eat anything, they just camp there to protect their babies for about 2 months

[@andrewvirtue5048]

I feel like this somehow explains why that when I was a kid, I would go outside and just lay in the parking lot in front of my apartment. I enjoyed the heat that radiated from the road. Or go sit in my moms car as it cooked in the summer sun. Because I was really under fed, and was always hungry!! This makes sooo much sense!

[@afqwa423]

Yeah, there are some extreme calorie-restriction diets that can extend your lifespan if followed rigorously throughout your life, but apparently has that effect of lowering your body temperature (and mood) correspondingly.

[@ashwintayade7274]

This explains my body too. I am not fat, I am just cooler XD

[@afqwa423]

@@ashwintayade7274 I think women tend to be cooler on average. I forget why. Probably something to do with women tending to put on weight better and "save" up fat for lean times and pregnancy. Women tend to have better rates of survival than men. Evolutionarily speaking men are "disposable." By some perverse joke of nature, women also tend to have bigger appetites too.

[@NoFaceInTheCrowd]

I'm so sorry that you went through that! Hope that you're ok now 🤗

[@kaitlyn__L]

@@afqwa423 when trans women start HRT, temperature sensitivity increases, too. (And vice versa with trans men.) So there’s definitely some switches getting flipped by hormonal signals (possibly just the activating and deactivating of certain genes?)

[@miraculousmarrtian8753]

The Egg in the frying pan was a classic. Best way to educate about drugs. Just say they all melt your brain.

[@unitedchainsofamerica]

We should legalize all drugs

[@notverypog]

@@unitedchainsofamerica and melting of brains

[@rexsongodinho5623]

@@unitedchainsofamerica yeah if alcohol and tobacco are legal drugs should be legal too.

[@otavio.a.8.r]

Great video. I just wanna add that this could also be explained by how heat helps some enzymes to work in a more efficient way. Furthermore, heat also accelerates the movement of molecules improving the efficiency of some molecular reactions. As you mention, life outside the water might require larger amounts of energy, so faster molecular reactions were really useful for these animals so long ago.

[@F_L_U_X]

Imagine fighting Reptile from Mortal Kombat... He's all intimidating-looking but when it's time to rumble he has to time-out and warm up by the fire first.

[@Burn_Angel]

He dies if he gets frozen by Sub-Zero.

[@ericandfamily3772]

@@Burn_Angel Fatality

[@graysonsmith7031]

10:40 I watched a documentary that showed crocodiles were surprisingly good mothers. At least for a short time after hatching.

[@DragonSkyNija]

Yupp they can even be better than some human parents.

[@sirreginaldfishingtonxvii6149]

@King Pistachion There's probably some really shitty human parents out there. DSN is probably right

[@speedy01247]

@@sirreginaldfishingtonxvii6149 there are true monster's out there, most animals are running more on instinct, where as humans run more on our sentience, we may feel certain ways, but depending on how we think changes how we react to said feelings.

[@minutemansam1214]

@@speedy01247 I mean, even animals will abandon their own offspring, or even outright devour them when given the chance.

[@italucenaz]

@@minutemansam1214 not crocodile mothers, or at least this is not a common behviour, also, they are run by instinct, we can chose

[@johngrace1312]

“Crocodiles aren’t winning any parenting award” - when they’re the single best parent among the non-avian reptiles.

[@xiii0722]

Thanks for pointing that out. I actually would have believed that from the video if I didn't read some comments.

[@johngrace1312]

@@xiii0722 I feel like I should also probably put some qualifiers here, Crocodiles have tenuous at best parental instincts, they’re not going to actively defend their brood, and they’re not above cannibalizing their brood either if conditions are dire enough, just like 90+% of the animal kingdom. But that’s also kinda their strength as parents, because for conditions to get dire enough for a crocodile to resort to cannibalism, is actually emergency status for literally all life in that area, because they are nothing if not survivors. And on the protection thing, like I said, most crocodile species will not actively protect their brood, but that’s because a fully grown croc is usually the biggest threat to anything that would hurt or kill the brood itself, and the brood will often stick close to an adult, even to the point of riding in their mouths or on their backs, and the adults just give 0 fucks about it.

[@xiii0722]

@@johngrace1312 alright, yeah I think I heard that before somewhere

[@gamerdorianyt1]

2:55 Yea I've noticed that since i was like 10. Now i experience it more often because i go to this summer academy and the Air conditioner is always on and it gets so cold that i get goosebumps.

[@shanerichins3532]

That wasn’t a Komodo dragon in the Komodo dragon image. It was an Asian water monitor Varanus salvator. Also, crocodiles are exceptional parents.

[@grantflippin7808]

most monitor lizards are mesothermic, so it kinda fits...

[@kit2770]

I was raised by a crocodile. Wonderful memories.

[@l.n.3372]

Crocodilians are very good parents. I was just about to comment that too.

[@SlashHarkenUltra]

🤓

[@abdulsabri6551]

​@@SlashHarkenUltra shut up

[@Avabees]

It does make sense that a lot of dinosaurs were meso or endotherms considering their entire modern lineage ended up becoming endotherms after the extinction

[@Leto85]

Not only that, but animals tend to adapt to what is needed for them in that very situation. For some reason this reminds me of convergent evolution, but since that term wasn't used in this video, I'm not sure if it fits.

[@Burn_Angel]

@@Leto85 Both mammals and birds being endothermic is because of convergent evolution tho.

[@mikeg2306]

Why would dinosaurs remain mesothermic for 150 million years? Were they scared to take the final step into endothermy? (Being a little facetious here). It just doesn’t make sense.

[@acurarl9929]

Thx for sharing everything in C rather then F. Really hits home.

[@edilbertorivera3467]

"Keeping the body warm is expensive", not if you eat rice.

[@ErikOlexiewicz]

“Being this hot is hard work”: Joe, 2021

[@blobishlybelfer2717]

Well, Americans are 97-99 degrees, most of us are at a healthy: 36/37

[@666tonsofsquirrels]

And scientist bodies are at 309 “degrees”

[@maryann2628]

Not funny

[@Gamer-uf1kl]

@@maryann2628 just like you

[@mfhberg]

My wife is 37, I'm 98, but our little girl goes from on to the other, almost instantly.

[@NathanSMS26]

So you’re saying Americans are hot?

[@tb1211]

Those birds using that giraffes neck as a perch, knowing there’s not much it can do to stop them are a holes 😂💀 There’s a whole tree right there! 💀

[@waterzap99]

They probably also eat the ticks off its neck

[@Najakeeper]

Crocs are great parents. They wait by their nests without feeding for months and some dig and carry their babies to water in their mouths. Babies also call for their parents when in trouble. Better parents than some people I know for sure.

[@sooperdooper5967]

*me watching this while eating and also under a blanket because I’m cold* huh

[@kaitlyn__L]

I’ve noticed I feel colder during eating (or when I’ve let myself get too hungry prior to eating) and warmer a little while after. I don’t know if it’s energy being redirected to digestion, but that’s been my hypothesis.

[@speedy01247]

@@kaitlyn__L digestion creates heat as a byproduct. (Basically everything except for things specifically built to heat up create heat as a byproduct)

[@kaitlyn__L]

@@speedy01247 I know, hence “and warmer after I’ve eaten”. But when beginning to eat after a long while of not eating, I get a sudden cold feeling. And I suspect energy is redirected from keeping me warm to getting the digestion going again. After all, it’s commonly known that chewing sends signals to make the stomach active, it’s not like it just goes all the time.

[@nothinghere7585]

Same

[@marcpeterson1092]

Maybe you should evolve some fur.

[@NewMessage]

Um. There are a few lizards that run fast on two legs. The Australian Frilled Lizard and the Collared Lizard, off the top of my head.

[@clementinebriar1898]

Monitor lizards also have mammalian hunting behaviors

[@jacobgillispie1175]

That's only a secondary means of travel usually to chase prey or to run at predators making themselves to look taller

[@NewMessage]

@@jacobgillispie1175 Bipedal running isn't the Basilisk's main mode of transport, either.

[@ssgoko88]

They also can't breathe when they run

[@clementinebriar1898]

@@ssgoko88 nah monitor lizards can do both at the same time. And anyway, lots of quadraped mammals have to sync breathing and moving.

[@rogersledz6793]

Thank you so much for uploading this video. It is helping me get through the pandemic!

[@Gutterrat69]

I like how you gave us 1 Fahrenheit conversion and then never again (Derogatory)

[@kirknay]

Being warm blooded can be comparable to a jet turbine as opposed to a piston engine. Sure, it burns more fuel passively, but the things you can do with that fuel are insane in comparison.

[@FriesPG]

I can pump *fuel in u* 🙂

[@PJ3232PJ]

Why do I have the food cravings of a hummingbird but the body of a human?

[@perialis2970]

warm blooded animals: man its winter :/ cold blooded animals: lmao im loggin off till its next year see you later man

[@plontulublalulu]

8:36 is this implying that the dinosaurs got physically roasted by the meteor, like they teach us in elementary school? lol

[@mikeg2306]

I’m sure they tasted like chicken, a close relative.

[@spencerthompson1049]

I have type 1 diabetes last week my parents had to call the paramedics I had an insulin reaction, when the paramedics measured my temperature it was 82 F I was colder than a crocodile 🐊 lol

[@chengkuoklee5734]

@@therewasoldcringe Luck? Something so insignificant that we took for granted

[@pawprints1986]

Depends where you live, for me real human degrees are in F as well. I'm glad you survived that! Allow me to blow your mind a little though. I live in a border city, so was exposed to both scales regarding weather... To this day I use C for winter and F in summer, and for the in betweens I'll alternate 😂 🤷

[@Hiznogood]

9:32 Tuna can ... hehe I see what you did there!🤣

[@NiMareQ]

At 10:40 the subtitles read "And though cooler bodies might not get sick as often, since our warm bodies are great germ incubators, getting sick would be more deadly, since the heat we are able to create during a fever is a key part of our immune system."

[@trinxic-music1469]

8:24 legit got an ad as you finished your sentence: “That happened because this happened” *queue ad*

[@wh6055]

Thanks for being such a gem, Joe. Love seeing you love what you do, warms my heart, really. And wow that production value of this series, gets better every week.

[@umam.1755]

I've been interested in this topic since I saw Krish Ashok's thread on the relationship between being warm blooded and preventing yeast infections. This was very cool. Thank you!

[@geo8626]

0:29 the bird chilling on the Giraffe😅

[@RobbieSkaff]

Thank you for making another interesting video and giving me something new to learn : )

[@peternouwen]

2:08 “10% of daily calorie intake is just for regulating body temperature.” A human brain sees that number and laughs it’s pants off with 20%... 😏

[@lucadelaurentiis6907]

I actually think the brain uses 20% of the oxygen intake, not of the energy intake. Furthermore, these sort of figures often overlap: circa 40% of all the ATP produced in your cells is given away just to keep the Na+/K+ pump working. But that pump working is a prerequisite for most of the physiological functions running, even neurotransmission in the brain.

[@LaManchaST]

I'm barely in the middle of this video, and I have to admit that is really good. I'm not amazed at the data (I already know a lot of this) but the logic and process to explain it results in a very clear and clever way of teaching. Thanks for this video.

[@jimparsons6803]

Liked the presentation. Also liked the crack about 'having to go with what you got left.'

[@gin6342]

7:53 is that a Clever Girl- No Drum and Bass in the Jazz Room reference? Someone has great music taste.

[@fransende]

8:52 Shrewdinger: he's capable and not capable of producing body heat at the same time

[@rj5848]

0:40 i starting thinking about viruses when he said if we eat a crocodile

[@earlchristophersegales4217]

Such a cool explanation for a hot topic! :) :) :) Keep it up! Thank you for sharing this

[@Datadopamine24]

Love your channel man

[@amymarch8221]

Thank you for continually providing great, easily "digestible" information , in a such a positive manner! This episode on body heat made me curious about my current situation with hot flashes due to menopause. Why does this occur? I know that matriarchs in an orca pod go through menopause as well. Are there any other species that do this? What is the biological function? I would love to hear your take on this weird (yet common) phenomenon. Thanks!!!

[@majacovic5141]

Elephants too. Menopause is a risk-reward trade off in social animals. Pregnancy is risky when you're older, but experience is valuable, and someone watching the baby while mom is foraging/hunting/working is crucial.

[@kaitlyn__L]

I’ve got pals with autonomic dysregulation issues, so they think about it more than others might do. As the constant cycling on and off of cooling and heating systems you mention, can overlap with them. When they’re too cold, they shiver, but they ALSO sweat more. While most people like to have a room slightly cooler to sleep in than to be awake in, it’s the opposite for those pals, because otherwise they wake up dehydrated and covered in so much sweat that they’re woken up by the shivering as a result of this mixup. (They also have erratic heart rates, dizzy spells, and other such things.)

[@Malaima]

Loved this episode!! Love you so much!!

[@rv3superstar]

Honorable mention to warm blood seemingly protecting against various pests that cannot survive the heat.

[@GodModeMaker]

Your videos make me have an existential crisis and the reminds me of the fact that as a human, my body is doing much much more than what I think it is. My leg muscles helping me walk isn't just that. The amount of work done by my body goes unnoticed but this guy made me remember xD

[@BioniclesaurKing4t2]

"…and just like you have to constantly feed wood into a stove to heat a house…" (looks around confused in Floridian)

[@priyanks91]

Loved it, thanks alot ! Question: I couldn't understand the correlation between being warm-blooded and having time to take care of your young ones. I mean, if one is warm blooded, wouldn't they have to spend as much time to get more food, 'to keep the engine running' ?

[@abrahamwondafrash7549]

I loved it but since it is filled with a lot of content I felt sleepy ....and this is my second time watching it and also feeling sleepy.

[@cdrice999]

0:15 "80,000 calories per day," you say?........ CHALLENGE ACCEPTED!

[@TheDhammaHub]

It is a pretty big advantage to have a more stable "environment". We don't need as much DNA that encodes responses to different temperatures that way ;D

[@rj5848]

We have different skin colour for that

[@spindash64]

@@rj5848 Not really. Skin tone is related to UV radiation, not infrared

[@rj5848]

@@spindash64 i mean black people can resist extreme heat which white people cant do

[@rolfs2165]

@@rj5848 Your resistance to heat/cold comes down to what you're used to, it has nothing to do with skin colour. BPoCs living e.g. in Norway for a long time have the same comfortable temperature range as white people there. It just takes some time for your body to acclimatise to its new surroundings.

[@rj5848]

Oh ok

[@serenarose54]

My zoology teacher told me that we're warm blooded to become more efficient as in stay working for longer. If we were cold blooded we would have to undergo hibernation to prevent our body temperature from changing (when you're body temperature rises by a few degrees F, it gets so hard for you. Imagine a cold blooded animal. I mean the temperature of the environment can range from -30 to 60 degrees celsius. It would be a nightmare if a creature's body changed so much.). But I think this would be more related to being homeothermic.

[@gleann_cuilinn]

“for us that just means going to the fridge” *agricultural workers who spend hours in the sun doing backbreaking labor to plant and harvest our crops stare incredulously*

[@molycow]

"Hey smart people, Joe here." Gosh, I've missed that...

[@samuelcid1726]

Relateble

[@Mii.2.0]

And the, "stay curious."

[@F_L_U_X]

I've been watching this channel for quite some time and I just realized that the small text was the opinion of the globe that's in the back of the room. It's much funnier now. I always just thought it was the opinion of the editor.

[@sagee.venus333]

brilliant !! answered my question perfectly! .

[@loriewillis464]

Found channel last night. Binge watching NOW!!!

[@dibershai6009]

10:40 crocodiles are actually good parents or at least right after their babies hatch

[@limejet2566]

thanks for the great video c: still watching but a good question in the title!

[@Alberad08]

Thank you for sharing this! BTW I had to think of ectotherm animals which are known for showing great endurance and strength under extremely cold conditions: salmons. They are able to muster incredibly power & endurance when swimming stream up in icy cold water. I remember once asking a biologist for this, years ago, and she answered with her best educated guess that they might make use of enzymes, id est catalysts, that grant a high (similar to being warm blooded) metabolism without turning the temperature up because these animals are just too small to maintain a significantly elevated temperature in water that's thus cold (oftentimes 32°F/0°C or even less, being kept liquid only by its rapid movement). Is there some more specific knowledge about this today?

[@peterweinmann3722]

Ein Hecht ist im kalten Wasser leistungsfähig und im warmen Wasser auch. Viele Fischarten auch.

[@trevorzane272]

I wish he would make videos for Nursing! I would get an A cause everything he teaches actually sticks to my brain.

[@tiffanymarie9750]

It feels like science youtube got together and all decided today was "use elephants as our example" day 🐘

[@robinhahnsopran]

Joe: "10% of your daily calorie intake is dedicated to regulating your body temperature" Me, a person with dysautonomia, meaning I regulate my temperature extremely poorly: "WHAT A WASTE OF MY RESOURCES"

[@kaitlyn__L]

Oh, that’s a new term for me. My pals with it just call it autonomic dysregulation. (Maybe they’re subtly different?) They get too hot and too cold all the time. Shivering while also sweating. Etc

[@robinhahnsopran]

@@kaitlyn__L They're synonyms, as far as I understand it! :)

[@kaitlyn__L]

@@robinhahnsopran guess it just depends on the diagnosing doctor’s preference! Which term someone gets introduced to.

[@robinhahnsopran]

@@kaitlyn__L That's probably true! Do your friends have other diagnoses to go with autonomic dysfunction? I have a genetic connective tissue disorder (EDS) that's caused the dysautonomia, and in most EDS communities, it's called that... I was wondering if maybe it's called dysautonomia more in the context of co-morbidities, and autonomic dysfunction if diagnosed differently?

[@kaitlyn__L]

@@robinhahnsopran actually, they all have EDS, but they learned the term autonomic dysregulation from PoTS orgs rather than EDS ones. (After they learned EDS causes PoTS. At least one of their docs actually just called it “autonomic issues” more generically IIRC.) I’m glad you brought this up, because I wanted to ask if you were bendy too, but didn’t know if it was okay or not haha. My pals I bring up are from the UK, so it might be a regional thing too if you’re from the USA?

[@sivaprakashreddymalam4647]

Great info brother

[@engineeredtofail6746]

"We are pretty good at regulating our own temperature because we were designed to do so" Me: *starts sweating when It's cold*

[@ThePrufessa]

10:55 hahahaha he added a whole new meaning to this phrase used amongst the most vain people.

[@danpreston564]

I always thought that being able to breathe through the mouth was an evolutionary mistake, allowing choking and not being very good when you’re nose is blocked.

[@tedarcher9120]

Blame fish

[@lizardman1582]

There are a lot of evolutionary mistakes because evolution is largely random, there’s no hand guiding it. It only has to be good enough for the animal to survive and pass down its offspring so unless a characteristic flaw is detrimental to the survival of the species it will continue to get passed down

[@danpreston564]

@@lizardman1582 and I always thought being able to choke on your food and not able to eat properly when you have a cold were those detrimental things.

[@bearmaster2924]

@@danpreston564 also breathing through mounts cause bad facial appearance

[@jessicalv6442]

This video is FANTASTIC!!!!!!! It makes me feel like "any men who knows a thing knows he knows not a damn damn thing at all~." I love this feeling. Thanks!!

[@MichaelFenley]

Always great videos.

[@badscientist42069]

I was just wondering about this a couple of days ago. They're reading my mind! :o

[@bemascu7087]

I can't thank you enough for using Celsius too. Farenheit is the one unit that I can't mentally convert...

[@runningbear1982]

Maybe next time your country will fight harder in the war.

[@bemascu7087]

@@runningbear1982 What?

[@PatricioHondagneuRoig]

@@runningbear1982 Vietnam would like to have a word with you

[@runningbear1982]

@@PatricioHondagneuRoig that was a conflict not a war.

[@PatricioHondagneuRoig]

@@runningbear1982 nobody cares about what your stupid congress declares, it was a war.

[@joshuajoiner3789]

When he said "journey before destination" I really felt that.😤

[@7kortos7]

going through high school when I was in my peak physical condition (thanks to gym class) my average body temp was 99-100 and I legit NEVER got sick in my entire 4 years of high school. people told me they could feel the heat radiating off me at times, did anyone else have this too? (I was very fit, Track and field, football, and weightlifting.)

[@n.i.g.e.l]

Wait, we're warmblooded? Why does it always feel so cold then :(

[@Alkaloid-Odin]

We must be lizard persons I guess

[@SopanKotbagi]

I'm a boomer and this is deep

[@domagojmartinovic9491]

Lmao

[@kalwidorntheimmortalcaptai2435]

You answered your own question. You feel cold because your body temperature is higher than your environment. Which means warm blooded. Stick your hand in a warm water tub of or a bucket,you wont feel warmth after sticking in there for like 30 seconds.And hold your other hand with it,your wet hand will feel a little hotter than the other hand because your hand absorbed heat from the tub and your hand matched the water temperature.

[@graysonsmith7031]

Because the environment which is colder than you is actively pulling away your heat. You feel heat transfer, not temperature. If you were cold blooded you would feel cold for a time until you are at the same temperature as your environment then feel nothing but sluggishness (or be dead). I know this was a joke question but I felt the answer was interesting.

[@theoverseer393]

Perhaps certain enzymes function best at higher temperatures, that happen to be better than cold-blooded enzymes? Regulating temperatures helps to ensure you have a stable environment for cells and enzymes

[@ghydeon]

i think for the 'its ok to be smart' animation id like to see the logo moving around and shaking a bit and then pops open with the shows title "Its ok to be smart". kinda like unlocking your potential or breaking free.

[@tommunyon2874]

Back in the 1970s I came across a body builders' magazine at the news stand. One column by a so-called expert said it was important to stay warm, otherwise one would put on body fat, like an Eskimo, in order to insulate against heat loss. I was in college, majoring in chemistry, at the time, and thermodynamics was one of the required courses. By my reckoning one would burn more calories to keep warm, and thus reduce the chance of putting on body fat.

[@wanzie_]

With these "great dying" and "great drying" names, are future humans going to call this era the "great heating"?!

[@GPrinceps]

Or *The Great Frying* :D I'm from Cuba, we love frying foods esp. during summer. :)

[@wanzie_]

@@GPrinceps 😂😂😂 i love that! Hi, I'm from Kenya.

[@nunyabiznes33]

@@GPrinceps Was about to say this when I saw OP's post. I do love fried bananas on my arroz ala Cubana.

[@pinkgoergefloyd8340]

All humans are warm-blooded... except your ex

[@maryann2628]

Fake

[@Herewegooo.]

I see what you did there

[@alvinamarille6502]

Thank you so much. I learned a lot

[@micahbirdlover8152]

I like when joe says stay curious 😊

[@johnglaybunao3246]

🤔 My teacher said that love comes from the hypothalamus and not from the heart 🤷🏻‍♂

[@Chandu_devavarapu]

Yeah that's true!!! Because love is our feelings for others and these feelings are developed when certain hormones like dopamine are released from the brain

[@rdcyoutubediary]

That's true. Heart actually just pumps blood. Even so, we can say that 'heart' isn't the literal 'heart' when we say love comes from the heart.

[@maryann2628]

Not true it comes from heart

[@ivantolosana5594]

@@maryann2628 Study

[@aaravrastogi9466]

The great drying and the great dying, that’s hilarious

[@TheSamknu]

There is n endothermic plant in the driftless region of the Midwest. It melts through the snow to flower.

[@Mazequax]

Looking great, Joe! :D