3 Surprising Ways Humans Are Still Evolving
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- Опубліковано 28 тра 2024
- Evolution gave humanity powerful brains, flat feet, and opposable thumbs. But it's not through with us yet. Humans are still evolving new traits that help us survive and thrive in a changing world.
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Following is a transcript of the video:
On the outside, it may seem like we haven’t changed much from our early ancestors. But take a closer look and you’ll discover that humans are still evolving in some fascinating new ways.
HOLDING YOUR BREATH
The average person can hold their breath for 30 seconds. But Bajau people in Southeast Asia can hold it up to 12 minutes! Which comes in handy when they freedive over 230 feet for food.
Part of the reason is simply training and experience, since they spend over half their work day underwater But it turns out the Bajau also have a genetic mutation that makes their spleens 50% larger than average.
Our spleens are what filter and store oxygen-rich red blood cells. So, when the Bajau dive underwater their larger spleens contract, which boosts oxygen levels in the blood by up to 10%, allowing them more time to collect food. It’s a handy adaptation that probably came from living on houseboats for the last 1,000 years.
DRINKING MILK
About 35% of the world’s population has the equivalent of a genetic superpower: They can digest milk as adults. Not impressed? Then consider this: humans are the ONLY mammals on the planet with this ability.
Thanks to a genetic mutation that popped up in Europe around 5 to 10 thousand years ago. Those with the mutation produce lactase throughout their lives. That’s the enzyme that breaks down milk sugars for easy digestion.
All other mammals, and humans for most of history, stop producing it after childhood.
But once those lucky few Europeans could drink milk as adults, that suddenly meant extra nutrition and ultimately healthier, longer lives so that they could pass their superpower on to future generations.
Today, roughly 95% of Northern Europeans have the mutation.
FENDING OFF DISEASE
The human body has an estimated 20 to 30 thousand genes. And while some mutations can change our spleens and diet others can protect us against deadly conditions, like AIDS.
Nearly 50% of women in parts of South Africa have HIV. But researchers found that some show a stronger resistance to the virus taking longer to develop AIDS, or sometimes never getting it at all.
Turns out, these women also share a mutation in a gene called HLA-B27, that the others lack.
Does this mean we're going to evolve our way to HIV immunity? It’s too early to say. But one thing’s clear:
Evolution’s not done with us yet. - Наука та технологія
All these mutations yet evolution still hasn't thought of a way to stop me from accidentally biting my cheek
Just cut em, no cheeks no problem
Than how do I drink the blood of my ennemies if it keeps coming out ?!
You make it a habit to forcibly stop yourself from biting. You need to do it explicitly. 3 or 4 generations later your lineage will have evolved to stop it from happening naturally 🙂
Ughh that hurts
That's you problem.
1:44 did that girl just become a dude?
Nole HOLY SHIT
Mutation
I laughed so hard
Nole its a damn trap
REEEEEEE
I'm a mutant. I can digest milk.....impressive!
Me too wonder what one of our ancestors first figured it out 😂😂
@@lewiitoons4227 I cant
*cries in East Asian*
@@Laura-Yu south east asian too..
@@Laura-Yu but you can digest rice...
Here’s another way we are evolving. I’ve been in the dental field for over 20 years. People are slowly evolving to have less wisdom teeth. Some patients only have two or three wisdom teeth, (instead of 4) sometimes one or none at all. Our jaws have gotten smaller so there is just no room for wisdom teeth. I’m not a scientist but it feels like our mouths are evolving so teeth fit our smaller jaws. Weird dental side note: The strangest thing was that we once extracted four wisdom teeth and joked with the patient that we planted four seeds so they would grow back. A few years later, four new wisdom teeth were growing. He blamed us and we couldn’t convince him otherwise. ;-)
Crestfire
Exactly! 🦷
Woahh- Last part was shocking lmao
If you eat sturdy food as a small child your jaw will get wider and you'll have enough space to fit those teeth. Also your face becomes more attractive. You can even change your facial structure later in life with something called mewing.
@@magicmerls291 I started chewing ice as a kid. Still had overcrowding and braces.
@@TurtleTimeVoiceOvers chewing ice every once in a while and eating raw vegetables, hard crusty bread and chewy meat every day are two completely different things. I did the latter and so did my sister and both of us have perfect teeth (every new dentist asks if I've had corrections) and all four wisdom teeth fully grown out with enough space left. There's a video regarding the topic called something along the lines of: "can diet change facial structure" by better ideas
We are evolving. Fortnite added that you can thank the bus driver
Oh I remember you
I offer a mutagen with non humans DNA.
Here an exemple of Peak human evolution > ua-cam.com/video/UAskqjcwjaE/v-deo.html
I gotta long back on!
*Oof*
I hope the eyes would be stronger so people don’t get blind and wear prescription glasses.
Wildgamer 912 people are evoving blue eyes due to battle of the sexes.
Humans will not evolve better eyes. Because people who need glasses are passing on their genes just as much as people who don’t need glasses. Needing glasses isn’t affecting the survival rate of humans so need is not gonna go away naturally.
Sad
Yeah, evolution isn't so kind and considerate of what you want. Doesn't work well with technology either
People in future may evolve with the help of bio-technology
People have evolved to watching memes and playing fortnite
@@Emma-ex8gx 😂😂😂
PUBG
Mugilesh Anand Wtf are you doing son? This is a good meme comment why are you saying PUBG?
Memes>fortnite
**ASCENDED**
Here in the Philippines, I witnessed a group of Badjao divers hunting for a fish. Yes, it is true that they can last for up to 12 minutes underwater, but 230 feet below sea level? Hell, no! They can only reach for up to 40-80 feet below.
Wait we Filipinos can do that?
Eddremurr 2008 😂
I saw a Badjao break a jeepney’s break lights near Guadalupe because noone will give them money. I also saw one play drs using a Pringles can.
@@idioticed4379 only that tribe in our country, though. :)
@@rzgomez4744 what you see is the consequence that has accumulated from something petty, to distressing. Their culture has been thrown under the wheel and dragged for years by ignorant leaders constantly increasing in number. People misjudge by seeing them as impure/immoral. That may be true to some extent, but still, keep in mind, there are factors contributing to those.
Don't forget memes, the pinnacle of human evolution.
Waht do we waant?! Da wae, da wae....!
Nöpe
Amen brother 😂
Do you think that Shrek was 10 thousand years ago are you mad!
See? we are all Pokemons
I too thought that
YouCan'tAlwaysGet WhatYouWant Except for that marine reptile that evolved into Shin Godzilla.
Ik where u profile photo
Wait pokemon doesn't use evolution it's just metamorphosis
*Pokémon
Evolution might not be done with us, but the planet might be.
Oooooof that roast was 🔥🔥🔥
haha sooo true
Human body amazes me! Can’t wait to be a cardiologist and perform heart transplants-helping people live longer!!!
Julius and Crew why people want to live longer if they do all things they wanted to do ?
arcanax 210010 Could you shush please?
Health doesn't make money.
Sickness do.
Human penis amazes me too! I want to be blowjobolist!
arcanax 210010 well, some people are actually born with heart defects; my little sister has bicuspid valve disease and will eventually need heart surgery. Those that destroy their heart through substance abuse :/ actually have a harder time getting a transplant; some organizations won’t include anyone with a history of drug and alcohol use, especially when the transplant waiting list is long and they have a history of relapse.
There should be a project to gather genes from exceptional individuals and groups to try and make these beneficial mutations more prevalent and flawless, while making them widely available through therapy’s and pre birth modification. Imagine whole swaths of new populations that don’t have to deal with lactose intolerance, or increased natural disease resistances. Or how many lives in water rich areas that can be aided and saved with being able to hold your breath 24 times the normal capacity.
Lmao what decade do you think you live in?
Brandon Guzman Good idea but researchers can be biased and genes considered superior will end up shaped by prejudice. If it can be done fully objectively then it’s a good idea
There would be many objections to that idea because of differing morals and values
We have the technology to do that now but there is a barrier of ethics that is preventing it from becoming available. Cost is a big concern I.e the rich can have designer babies while the poor will still suffer from birth defects and health issues. Also experimentation. We have to practice to make a human with super genes and if it goes wrong the first few times what happens to those babies? I’m with you though it would be cool
So much potential. And with genes being genes, if all goes well, you can trust them to be passed along to future generations, so it could pay for itself over time.
First
.. Episode of Spongebob Squarepants was called "Help Wanted"
My first favorite episode I watched was either "A Pal For Gary" or "One Course Meal"
@@actic555 my favorite is "Band Geeks" or "Sandy's Rocket."
my favorite is the bootleg spongebob vhs
Waiting for the "Actually," guy.
@@dougdimmadomeownerofthedim2918 Actually there can't BE an "Actually" guy since what he said is correct.
1. Adult lactose tolerance evolved independently in loads of places loads of times 2. Hiv/Aids numbers in South Africa are reported here as overblown and vague - fan of the channel, and mostly accurate, but those two ideas in particular can be dangerous to circulate erroneously or without context.
The spleen genetic adaptation is fascinating. I thought at best that only people living at high altitudes would adapt to absorb more oxygen from the air, but combine it with the spleen one and I bet you'd have superhuman-level oxygen intake. Which in turn would spurn greater muscle growth and strength. We could be talking about Usain Bolt-level sprint bursts... and perhaps even beyond that.
#SCIENCE! is truly awesome.
Let's hope we don't end up like Idiocracy :)
That was a good movie
+Dont Know Don't Care Indeed but I'd rather not see it come true irl :P
I’ve watched it on Netflix and it was funny.
As soon as we accept gene editing it won't matter who is breeding. China has the right idea, it's just a shame that the west is starting to deny science/micro-evolution.
@@violet-trash Hmm that's an interesting point.
I like how there's literally a people that can hold their breath 24x longer than ordinary humans, but the video considers drinking milk a "super power." 😂
Another way to describe natural selection in evolution: It is fucked up.
Tech Insider: Humans are the only mammals that can drink milk.
Cat: Am I a joke to you?
Actually feeding cow milk to dog and cat are bad
Adeep Iqramp I am not sure humans can drink every kind of milk.
Only kittens can drink milk adult cats will get sick
My cat gets intense diarrhea whenever my family gives him milk, don't feed cats with milk
You shouldn't be feeding adult cats milk, it's really bad for them.
I swear at time I can hold my breath for so long it feels like I’m going to another world and it’s so magical
That's called passing out..
+Alex Thompson 😂
That’s called Hypoxia,a lack of oxygen causes mild euphoria
thats you hallucinating from lack of oxygen to the brain
No one said humans ever stopped evolving and they will never stop
Technically, almost every living species is continuously evolving at a minuscule rate. That is how life has flourished over millions of years on Earth
I can drink milk I am not european!
cathy2000 taths normal now for all the planet
The video said 35% of the population can drink milk and 95% of Europeans can drink milk. You don't have to be European to be able to drink milk as long as you are part of the 35%.
I can't. Pure dairy makes me sick.
The same here
I'm European and can drink milk
Me: We are bound to be immune to cancer soon
Also me: I'm gonna fly like a birb
What??? Drinking milk is uncommon?
I think they meant that with time almost every person can digest milk, for the exception of those 5% present who can't consume it. 5000-10000 years ago it WAS uncommon, but not now
Don't be stupid, you tough all humankind like to drink milk???? It is ok for Eropean, American, African, or Middle Eastern.... But for us as Asian we couldn't digest at all, we will get diarrhea after drinking milk on daily basis. So that's why most of Asian are slim and short body
@@sartanisimon9493 i dont know which part of Asia do u reside in.
@@sartanisimon9493 yeah well I am Asian too and I love milk so it's not exactly reserved for Asia only
@@sartanisimon9493 that's utter bullshit.
You and many asians have trouble digesting milk because you're not used to it. But unless you are allergic to it you can.
It's just not the easiest thing to digest so if you never drink it and then suddenly start drinking milk, you will have for example, diarrhea.
But if you would drink a tiny bit tomorrow, and then work your way up, whitin a month you will be able to drink milk whitout issues.
We are evolving by making vines
Vines are died
Dead
Vine's dead
Vines are cringey and shit
Its memes
I'm European, and the lactose tolerance is decreasing. I'm lactose intolerant too, and so was my grandfather.
Because you are lactose intolerant doesn't mean it's decreasing for the whole. There are ~134 million europeans and scientific research was done on a much larger scale than just you and your grandfather.
0:43 Bruh this is the only thing that my teacher does not teach me lol.
we're so proud of our Bajau countrymen 🇲🇾🇵🇭
Bajau is not only in Malaysia and Philipines, there are many Bajau in Indonesia too, we call them "bajo"
@@MuhammadIrfan-wl4ep ok 💨
Get that Filipino flag out
Badjao people are discriminated in the Philippines
Luigi O They aren’t discriminated because of their ethnicity, almost all badjaos are feudal and hasn’t adjusted to modern society and this leads to some people looking down on them. If you want to see discrimination look at at the Papuans in east Indonesia.
Yeah we are evolving I'm even becoming much Lazier each day.
our human brain and body evolves everyday, it will be stupid to think that we’re not evolving anymore. Humanity will never reach it’s final evolution since we’re always finding new things that interests us.
When your friend hold breath underwater for 12 minute but he dont never come back
Just came here looking for a Evolutionist and Creation debate 👀
Elijah Salazar you won’t find one. Christians actually stopped casting pearls before swine.
Evolutionist?
Cheese and yogurt is tolerable for me and I can have it for a limit amount because something else is mixed with the dairy but pure milk makes me barf and suffer stomach cramps for the entire day. 😷
Well cheese and yogurt get their lactose destroyed by bacteria so that isn't much.
@@yanniskarageorgiou3573 Okay sure.
@@nicluvin3731 true xD
We humans as one need more videos on how we are evolving
I wonder how long will we evolve to naturally have COVID-19 immunity…if ever?
I predict in the next thousand year, humans will have little to no body hair because i see tons of advertisement for hair removal surgery
Unless a huge amount of people start finding hairy people attractive
This is just my prediction
Just Whatever do you even know how evolution works? For this to be the case, humans that do not produce body hair will need to survive whilst the humans who do produce body hair will need to die off effectively eradicating the body hair gene. This won’t happen unless something kills off all the humans that produce body hair
Me: Evolving a extra liver and lungs(after long abuse of alcohol and cigrettes)
Imagine if you could get spleen implants so you could hold your breath for longer.. or at least have both gills AND lungs, and not get wrinkly when swimming so you could stay underwater forever. Aquahumans anyone?
A friend held his breath for 15 minutes
...
He hasn’t come out yet
I'm from Northern Europe, and my family and I drink SO MUCH MILK every day :D
We consume about 3-4 liters a week
There is a difference between evolving and adapting, until our shapes change in a noticeable way...then we could say that we are evolving.
All of my family is concerned from cold weather ...where i have trained myself and adapted to cold weather....i took showers with a very low temperature around 6 to 2 degrees Celsius...and i didn't get sick after it.... I've done this couple of times.... I've stopped using hot water or warm....and i even go out to the street with a T shirt.
It's called adapting...not evolving.
Keep in mind that on the other hand.... I can't bear the hot or warm weather....like 25 degrees Celsius for me is hot.
It must be bellow 19 degrees to be ok for me.
You trained your body to do that(some people can swim in those températures. Athlètes can train to breath in high place. But the descendants of people that lived for a long time in mountains still have a genetic advantage.
Every animal and species is always evolving, not just humans. Tuatara, a reptile which is famous for aesthetically looking identical to what it did during the cretaceous [dinosaurs], has evolved as much as any animal, gene testing on members of the species from thousands of years ago show major differences. They may look the same but they are still very different and constantly changing, this is especially the case for animals with short gestation periods, and/or short life spans.
Evolution is a passive power of ours.
I belive human are become taller. I dont know if it count as evolution.
yes ot does
more nutrition than anything else.
No we become shorter
s fz Back that up with citations. Cuz everywhere I look says we've been getting taller.
For example, I'm 5'7, which would be considered normal in 1900, and is short now.
@@tylerslagel5485 the average human become taller but that dosent mean that dosent exist shorter people. I am 5'5 even shorter than you but taller than people with more than 60 years old.
evolution is a continuous process, it never stops
Humans are still evolving due to their surroundings. That’s why only certain groups have special “abilities”
It’s natural selection. Evolution is about what you have that allows you to survive. Not being perfect (that includes having a perfect brain that’s definitely smart)
First breathing underwater for a long time: Wow so cool
Second about to drink milk: lame everyone I know can drink milk, Wow she know I'm not impressed
Third fending off disease: omg that's so useful, I'm jealous.
I'm evolving into my final form
Unpopular opinion: milk is nasty
Kalei Valery Milk is nasty thank god more people are realizing we the only ones that drink another animal milk...Cow..Full of puss and blood and other shit.
@@crimepays8358 tasty :)
Are you guys talking about cereal sauce?
Xavi Alexis Meh whatever I don't mind drinking milk. Depends on the person's taste. Also I bet your anti vaccine.
Xavi Alexis other animals literally eat each other and your disgusted by milk..?
3 Fending off Disease
Covid: "Allow me to introduce myself"
-So what’s your superpower?
- I can drink milk
Ahhhh but most Arabs can drink milk and we ain't Europeans?!
West Asia. Close enough for me.
By now everyone can, unless you're allergic.
35% is not a fact. Most people can drink milk.
@Make it lucid I drink milk all the time with no issues but I'm black and white.
they're just whitewashing history (like they do with everything else) so many non-european communities can digest milk - I'm from East Africa and we were historically pastoralists clearly meaning we could ingest milk.
Creationists should watch this.
Why? Why would this convince anybody but the stupid?
It's one reason to make dumb religion people a little smarter.
I'm watching this in South Africa and that's scary tbh. U never know ur next date could be ur ticket to the hospital
They’re referring to ccr5-delta 32 mutation that hampers HIV’s ability to infiltrate immune cells. It’s super rare, but I wouldn’t say it’ll be common anytime soon.
I'm a turtle, am I gonna evolve into a human someday?
No. Evolution isn't something you choose you want to be. Its something you need to be to survive and to be good enough
Besides you cant just evolve imedeatly you have to pass of genes you have to be in an environment you need to have a need to be to evolve into a human it needs generations and years to evolve
R/woooosh
That Idiotic Genius 2008 r/woooosh
That Idiotic Genius 2008 your name says it all
Cats also drink milk.
They're really not supposed to drink cow milk.
James Sparks Maybe but nothing has happened to her.
Not really only baby cats milk is not good for adult cats. watching to many cartoons
Meow that's true...
Cow milk can be harmful to cats
2020:
Million years later: real life aquamans
nah were done evolving
Stop saying Haitch! It's an H like Aitch.
No
It's "haitch" if the speaker is British. Obviously you're not.
@@pompe221 bullshit. Most Brits cringe when they hear HAITCH. It's poor English no matter where you come from.
If something is evolving in my body, it must be depression or autism.
Badjao are here from the philippines!! Proud to be filipino!!
the style of the video looks like that of "Kurzgesagt - In a nutshell". Are these channels related somehow or is Science Insider plagiarizing a bit?
Yeah
No. If that was the case, you may as well say that over half the artists in the world plagiarized just for sharing similar art styles. This style just happens to be similar to Kurzgesagt's. The Infographics Show had a similar animation style for a while too.
Can i consider robots would be a evolving part of human
yes for sure and it will happen
cyborg pregnant cannot develop cyborg child
@@discovaria9507
You never know.. a scientific cyborg with human cloned organs that is created to be a copy of a women can become pregnant with an actual human
@@theelite9275 oh yeah okay and sorry for my bad logic
Also in 1 Billion Years: *People evolved to a Planet*
Says that a average human can hold their breath for 30 seconds
Me: *holds breath for 31 seconds*
Me: *I JUST DID A WORLD RECORD!!!!1!!11!*
lol i did 35
I'm of Asian origin, 25 years old, and I drink milk on a daily basis. What you gonna do??
Its only 30 percent of Asians who are lactose intolerant so don't worry your in that 70 percent who can drink milk.
I'm gonna give you a cookie. A milky cookie.
These proves that evolution and natural selection is true.
*Triggered Creationists*
It’s just a theory not proved.
@@nsr5961 u guys are joking right?
Discovaria the truth of the matter is, humans are never evolving. Just because a human can adapt to hold their breath for longer than others doesn’t mean he or she is turning into a fish. Humans always produce humans. Matter of fact; if one followed the sequence of life in all living things, one can trace everything back to two full grown adults. Babies always depend on their mothers and mothers depended on their mothers so follow this cycle as far back as time can allow and you would never find an end-theoretically. This only suggest that there had to be two full grown adults capable of reproduction. Also At what stage does a primate reproduce human baby offspring with cute features? And since when does “natural selection” make humans and baby’s beautiful in appearance? Exactly. It doesn’t. Beauty isn’t a random chance which wouldn’t even be needed for anything. The law of attraction doesn’t exist in a mindless random mistake called chance. With that being said, no creationist will ever be triggered by false teaching of evolution. There is no benefit in accepting those teachings and all it really does is take God (the only clear explanation) out of the picture. So have a seat evolutionist.
Matthew Tenorio_3200654 You are talking to a human here you ape.
2:11 stop,that's trippy
What???? I thought every person on earth can drink milk forever!!!??? Where I live, EVERYONE, be it children, adults, old people, everyone drinks milk! I even doubt that what you said is true or not!?
Everyone here in India can drink milk. Never met someone who can't digest it.
Ikr I live in Canada and I met like one person who was lactose intolerant.
yeah your right :)
Im indian and im lactose intolerant
Not everyone can drinks milk in India some of them r lactose intolerance
I love her voice!!!
Her H's tjo
Oof i could feel Kermits shame bellowing inside himself
Bajau can be also spelled as "Badjao". They are found in southwestmost part of Mindanao Island here in the Philippines and their houses are over the shores or shallow parts of the oceans made from wood..
This is just adapting.
Adapting --> passed down adaptations --> evolution
human er designed to adapt into their envorimnt to survive, i dont see eny human growing new kidney or longs to stay under water very long, forget about getting fish gills.
@@saadaq2005 dude you seem to not understand evolution.
Evolution is not
''creating something new to solve an existing problem.''
It is
''random inheritable alterations of the body solve a problem, which leads to increased chances of reproduction which leads to more people with that random inheritable alteration, untill everyone without it is filtered out.''
Evolution is the best way to adapt something, right?
Did you, watch?
Are these adaptations caused by activation of a preexisting genes?
Or by acquiring new genes?
Evolution is often a mix of both.
They can hold their breath for 12 minutes and dive down to 230 feet without scuba equipment?!?! Holy fcuk I would LOVE to be able to do that. That blows my mind. The deepest I've been scuba diving is 100 feet and even that seems like a LONG way down beneath the surface. I can't imagine going 130% deeper than that all on natural lung power and then being able to stay there long enough to hunt fish (I can't even imagine going down that deep even with scuba equipment on). Just going down 100 feet, touching the bottom and coming right back up would be achievement enough.
I have asthma, allergies, panic disorder, and a recreational smoking habit, and I just clocked myself in at a minute holding my breath. I think you might be underestimating all of humanity with your 30 second statistic. =/
As cool as this is, it makes you wonder how many people died from drowning, starvation, etc, before being able to contribute to the gene pool like their "superhuman" peers were able to. It's real-life equivalent exchange. These adaptations came at a cost.
4th is our brain, our brains are evolving just backwards
I just hope that our next evolution does not make us fight each other over toilet papers
Last time I check I can hold breath 2, 5minute+ with stopwatch, need a little practice for that. Since I'm smoking(not too much) I think I just can hold about 2 minute or less.
The top right corner says Tech Insider but this channel is Science Insider.
This is more like the body is trying to adapt to the environment
Wow good to know. Thank you!
Science is our hope
Anyone now wish that they were born 10,000 years from now?
Thanks for information.
I love how she says “Hash I V”
I held my breath for 2:06 right now without any training or anything.
Is this anything out of the ordinary?
i live in southeast asia and i can hold my breath for 27 mins.
Evolution is an eternal process it will continue to happen.
Proud Filipino here!! Badjaos do really and literally live in water, i aint a badjao but they are crazy amazing i tell you...
She missed the part where our heads are getting bigger and jaws getting small.
Another way is skin colour, people in warmer climates are born with darker skin colour due to the intense sun, and in colder places lighter skin, maybe for camouflage
No. People with dark skin have darker skin because it protects more from the sun. Now lighter skin appeared because Europe (and some other places) isn't hot.
@@bait8112 I said for darker skin due to intense sun. I just thought white skin is better for snow
@@zakaryloreto6526 not really but great guess
i am an indian, and i can say for one atleast 1.5 billion people have this ability to drink milk, and also we see no peanut allergies or even other dietary allergies or intolerance
Not sure about the last one, but I don't either of the other 2 adaptations
I want to live long enough to see where post-biologic evolution will take us. I won't.
On the other hand, there is a theory that humans are becoming less resilient to disease due to the current medical system, normally the people with weak immunity systems will die out and have less chance of reproducing, so the weak immune system genes would not be passed on. But now as medicine become more advanced, even the people with weak immune system will have a high chance of surviving and reproducing.