Evolution FAILS in the Human Body

Evolution FAILS in the Human Body


Hey smart people, Joe here. Bodies. We’ve all got ‘em. Couldn’t live without ‘em! But why are they so dumb and unreliable?! I don’t know if it’s because I just got
over a sinus infection or because my wife just had knee surgery, or maybe it’s just
me getting older and hurting more… I’M A MILLENNIAL!!
but I have been noticing lately that the human body… it’s got a lot of problems. And this video is a big long rant about a
bunch of ‘em. I mean don’t get me wrong, humans are really
awesome. Look at all we can do! It’s just that, there’s so much about
our bodies that is flawed. Like, so many of our parts wear down or are
easy to break, and others look like Ikea furniture would look if you accidentally threw away
the instructions before putting it together… in that it basically functions, but you’re
pretty sure something’s backwards and somehow you have like three of those little twisty
things left over?! The great American poet John Mayer once said
“your body is a wonderland”, but I think he meant “your body is a blunderland”. From eyes that don’t work right and backs
that ache to needy diets and extra bones… what I’m saying is… sure, our bodies look
cool–especially if they’re wearing an awesome shirt–but who the heck designed
these things?! Well, no one did. We’ll get back to that, but first, instead
of talking about how great we are, let’s talk about some of our critical weaknesses. The first example… it’s staring right
at ya. I mean, I don’t wear these things to look
cool and smart. I mean, they do make me look cool and smart,
but I wear them because I can’t see! Like nearly half of Americans and Europeans
or nearly 7 in 10 people in Asian countries, my peepers don’t peep right. I’ve worn glasses since elementary school. Space shuttle. Nice! Very on brand, younger me. Anyway, before the invention of corrective
lenses a few centuries ago, people who couldn’t see just… couldn’t see. And back in our prehistoric hunter-gatherer
days, that could’ve meant starvation and death. Bad eyes, empty stomachs, you lose. Thing is, even if you don’t wear glasses,
you have eye problems. While looking at this image, cover your left
eye, and look at the dot while keeping your face centered in front of the screen. Slowly move closer or farther from your screen
and the cross will disappear. Did it work? Around 30 cm or 12 inches away works for me. Pretty weird huh? You can try it with the other eye too. Cover your right one, stare at the cross,
and move until the dot disappears. That’s your blind spot, and every animal
with a backbone has a blind spot in each eye because of how the eye is built. The light sensitive layer inside your eye
is filled with tiny cells called photoreceptors. They’re like little microphones. One end turn photons of light into electrical
signals, and the other end’s a wire that carries the signal away. Except our retinas are built so the cables
are pointed towards the light, like talking into the back of a microphone. The cables from all those little microphones
have to pass through a hole in the retina to get to the brain. And where that hole is, we have a blind spot. We just don’t usually notice it because
our brain lies to us and fills in the image. Why do we have it? Because at some point way back in evolution,
when our ancestors started to evolve the first light-sensitive tissues, that’s just the
direction the cells were facing. And later, when those patches morphed into
actual eyes, it was too late. The backwards pattern was already set. Evolution can’t suddenly flip a whole eye
around. It can only make tweaks to what’s already
there. But cephalopods–like octopuses, squid, and
cuttlefish–they don’t have a blind spot. This branch of animals evolved eyes completely
on their own, and in early octopus ancestors, the cables on all their microphone-shaped
light-sensing cells pointed toward the back, so their retina is unbroken. Am I saying that cephalopods have better eyes
than us? Mmm, yes. Point, cephalopods. And another point for having eight legs. Ok, enough about eyes! Why is there so much empty space in our skulls? You know I can take you off the set any time right? Watch it, globie. When we breathe, air enters our nose and passes
through four chambers called sinuses where the air gets warmed up, humidified, and filtered
by mucous membranes. The mucus then drains ure is plenty in YOUR
skullout and back down your throat to your stomach. Mmm, gross. That works pretty well for the sinuses on
top, they have gravity to help them. But the big ones behind your cheeks? They drain up. Up! And that difficult drainage is why humans
get so many head colds and sinus infections. You know who doesn’t get sinus infections? Dogs. Dogs and other animals that rely mainly on
smell tend to have elongated nasal cavities, which drain down and back with gravity, the
correct way. But as our ancestors became more dependent
on vision and less dependent on smell, our snouts got smushed up into our flat faces,
and now we have tiny noses and get sick all the time. If you accidentally eat some air, no biggie. You can just burp it out. But if you breathe in your food, you’re
gonna choke and maybe die. What’s up with that? It comes down to the fact that like most other
vertebrates, we breathe and eat through the same throat hole, another one of evolution’s
amazing bright ideas. But I once saw a bird swallow a fish as big
as its head. It did not die. If I did that, I would die. But snakes and birds can swallow huge meals
whole because their nostrils connect directly to their breathing parts without going through
the throat. Like an alternate breathing system. But in every mammal, we’ve just got the
one tube, and all that separates the digesting part from the breathing part is a little flap
called the epiglottis. Epiglottis open? You’re breathing. Epiglottis closed, you can eat or drink. Mess up that order, here’s how to do the
Heimlich maneuver. Now, lots of animals can choke. Even whales can choke if fish get stuck in
their blowholes. Yes, that actually happens. But humans are especially prone to choking
because our voice box, or larynx, has moved up so high in our throats. I tell ya, these throats were made for talkin’. Some languages even make vocal sounds using
the epiglottis, like in some African languages. That higher voice box has squished up the
swallowing parts of our throat so there’s not a lot of room for error. But on the plus side, we can yodel. So maybe we can call this bad evolutionary
trait a tie. So. Walking upright. Pros: We can run, kick a soccer ball, dunk
a basketball, do sports things with all the other balls, ride a pogo stick, surf, ice
skate, dance, and dance dance revolution. Cons: So many unique and painful ways to injure
ourselves. Some of your body’s joints are beautiful. I’m a huge fan of the jaw. And the hip? That ball, that socket. It’s like Michaelangelo sculpted it. But the human knee and ankle look like an
elementary school art project held together by rubber bands. Back when our ancestors walked on all fours,
they had twice as many limbs and muscles to carry their weight. But when they transitioned to walking on two
legs, it put a lot more stress on our knees and ankles. When you quickly change direction while running,
the anterior cruciate ligament is basically the only thing holding the two halves of your
leg together. It has basically no blood vessels, and if
you tear it, the only way to fix it is surgery, which we only invented like a hundred years
ago. I have personally known at least a dozen people
who have torn their ACL. If we were hunter gatherers or ancient hominids,
every one of them would probably be dead. I don’t even know why I’m laughing, that’s
horrible. And right under that is the Achilles tendon. Since we walk on the balls of our feet, that
tendon takes basically all the force of the lower leg like a big fleshy rubber band. If you tear that one, you also can’t walk. It’s maybe the most important tendon in
your body, so of course it sits there on the back of our leg completely exposed, waiting
for the person behind us at the grocery store to ram it with their cart or your mythical
arch nemesis to hit you with a poison arrow. This is not how you’d engineer bipedal legs
from the ground up. This is way too many weak spots for any crucial
structural system. But when the assignment was “turn an animal
that walks on all fours into a fancy dancing ape on two legs”, evolution had to work
with what it was given. Body parts are one thing, but evolution has
messed up our insides too. Like, we are really poorly cut out for eating. Pretty much every animal needs the same nutrients
in order to function. Stuff like amino acids, vitamins, a few minerals. But most animals make most of these things
for themselves. But we have to get a literal grocery list
of nutrients from our diet. Take “vitamins”. That’s what we call essential macronutrients
that we have to get from our diet to survive. Vitamin C, for example. More than half a dozen proteins need vitamin
C around to do their job. Without it, your bones get brittle, your tissue
breaks down, you just bleed. Oh, and your teeth fall out. Scurvy is no fun. Pretty important stuff, this Vitamin C! So of course, we can’t make any. At all. We have to get every bit we need from our
diet. Almost every animal on Earth makes their own
Vitamin C. My dog never has to drink orange juice. Neither does a cow, or a cat. But I do. Strangely, humans have all the genes necessary
to make vitamin C in our DNA. Yet somewhere in our evolutionary history,
in some ancestor of all primates, one piece of the vitamin C machinery mutated and broke,
and now we have to eat it or die, along with all these. Of the 20 amino acids we need to build proteins,
our bodies only make 11. Many animals can make all twenty, but we have
to get almost half from our diet. Needing to have ready sources of these essential
nutrients has placed restrictions on where and how our species could live, at least before
we could walk into any pharmacy and get them all in pill form. Pretty much everywhere you look, it seems
like our body has room for evolutionary improvement. Our teeth? Most people grow a third set of molars–wisdom
teeth–that won’t fit in their mouth and have to be removed. Do I need to mention the fact that a male’s
gamete producing organs sit dangerously exposed outside the body? And the pelvis? Most women can’t deliver a baby without
medical assistance because the human head is so large. Who came up with all these bad ideas? The answer, of course, is no one. Thanks to science, we know that the human
body isn’t engineered, or designed. It’s evolved. Everything is the way it is because it got
that way, making tiny tweaks to what was there before. That means that our backs hurt because we’re
walking upright with a spine that used to be horizontal. We get fooled and we fool ourselves because
our brains evolved in a different world than the one we invented in the past few decades. Sure, our bodies are full of parts that barely
get the job done, full of things that could be built way better. And that can be frustrating, sometimes even
painful. But nobody, and I literally mean “no body”,
is perfect. Because surviving isn’t about being perfect,
it’s about being good enough. It’s about being imperfect in the perfect
way. If you’re watching this today, then you
are good enough. Because you’re a survivor of a 4 billion
year story. Our flaws make us who we are, because evolution
and natural selection made us who we are. Flaws and all. Stay curious.

100 thoughts on “Evolution FAILS in the Human Body

  1. Your body is perfectly imperfect. Thanks evolution!
    What's your favorite/least favorite evolutionary body flaw?

  2. Ya, from the matter spawning itself into existence from nothing, to the impossiblity of all the molecules needed to create a living preprogramed & adaptive, reproducing cell all coming together & binding at the exact same moment in the perfect environment that it could feed & not be instantly destroyed, then go on to self organize into bodies with super computer like brains capable of self awareness & the ability to create tools that gives that organizim basicly super powers. Then the organizim in its vast intellect & pride looks at all the evidence at hand & proclaims "there is no creator life is one big cosmic fluk" while at the same time can look at a simple cave drawing or find an alien spaceship & instantly reconize its a creation even though its own body is a far more complicated machine & why does it do this? Uh, its knee's & back hurt so there can't be a creator.

  3. Him: Who designed the human body? Well no one did.
    Me: Ok kewl.
    My Dad: taking a deep breath before going on a long rant about how you’re stupid and don’t believe in the bible
    My sister: reminding me to never listen to my dad unless he’s giving me money or talking about math
    Me: Ok kewl.

  4. Joe, it's ok to be smart, but this video is a classic half-empty/half-full glass of water. It has absolutely nothing to say about anything. Dude, get an imagination.

  5. Is there not a large percent of "Human" DNA that is not found in any other vertebrates on the planet? Just asking, because I think I heard that somewhere. Can you confirm this? Also, you didn't mention "Evolutionary Rescue".

  6. I would have been so dissapointed if he had not brought up the ridiculously bad "design" of the ankle. I have always said since I was a kid that the ankle is one of the worst evolutionary screws ups among humans. Hopefully evolution bestows us a thicker, stronger, and less fragmented ankle/ foot area as times progresses (that is, if we even survive that long).

  7. 5:55 epiglottis is not moving like this way .. its simply punched up during swallowing to meet uvula to block the food from trachea 🙂

  8. Okay….I would like to be smarter about the THYMUS. It is the first organ to “fail” in the aging process. It atrophies in puberty. I believe its function is as the site of terminal differentiation of the initial compliment of immune cells.

  9. Joe: "If you look at the cross and move further away from the screen, the dot will disappear"

    Me: "Bruh… That's awesome!"

  10. I'm not a scientist, otherwise I wouldn't be watching this show… But wisdom teeth are a redundancy mechanism, growing when we would have normally destroyed the back ones, little different that baby teeth & adult.

    My friend never grew adult teeth… Is he the next evolution? Or just broken? Lol

  11. Joe: If you're watching this, then your body is good enough to survive.
    Child with Leukemia: ^v—^v—^v—^——————————–

  12. Not sure who said/wrote it first, but the "you just have to be good enough" was also in my Bill Nye audio book! That quote/not quote was the icing on the cake to help make this a great video to watch and enjoy!

  13. They're still pushing this nonsense? The octopus' eyes are different because it lives in the water which blocks UV rays from the Sun. We live outside of the water, so there's less UV ray blockage, so if we had octopus eyes and went outside, we would have no eyes in no time. The octopus' eyes aren't "better evolved". We don't have extra bones, either. And you know who REALLY doesn't get sinus colds? People who don't eat crap food and consumes real nutrition. Sugar and chemicals bad. Nutrition good.
    Enough of the pseudoscience!
    Unbelievable.

    Still don't believe people are being lied to?

  14. In our hunter-gatherer days people did NOT have bad eyesight. It's modern living that causes our eye muscles to not be fully used. Like if you don't exercide you get flabby.

  15. I don't eat fruits from birth(my mom used to hit me to make me drink Orange juice and still I don't eat anything raw). But I don't have any deficiency of vitamin c (I'm 29 yrs old). I'm also immune to contagious diseases (everyone in the house got sick except me and that too many times. Once my friend asked if I was an alien caz I don't get sick) and I look younger than my age(as u can see in my profile pic). So some genes got turned on in me?

  16. We basically made ourselves this way because we improved and made lots of new technology way to much. For example, for all of our important needs, we just go to the store, and as centuries ago, we had to go kill something.

  17. I wonder if we created civilization too quickly thereby slowing down or rerouting the evolutionary process? If humans stayed in their natural state longer maybe evolution would have had the time to correct these flaws. Perhaps we're the equivalent of a premature baby that never got a proper incubator. We'll have to wait until genetic engineering fixes our flawed forms.

  18. I tore my ACL and was fine without one for over a year. For school, I ran a 9m26s mile and a half with no ACL. It has since been repaired, because I also tore my meniscus. I only found out about the ACL when my surgeon was messing with my knee to check for meniscus issues.

  19. I had four pre-molars removed instead of wisdom teeth and thats the way to go. Trades smaller teeth for larger ones that reinforce the corner of my jaw. When they pulled the molars even my smallest ones had root tips that curved and hooked around my jaws. The doctors at SLU dentistry explained that this means with a rubber mouth piece in my face is actually structurally reinforced by my huge teeth. Also i have an apparently large head. Xrays, cat scans and mris have confirmed that not only is my cranium statistically large its also substantially thicker, essentially the equivalent of homer simpsons fictional brain fluid layer when hes a pro boxer. I actually carry a passive gene that can cause uneven bone growth in the face and head but luckily this was less obvious in me than in some of my 19th century ancestors. Its almost a harnessed form of gigantism. Im also over six foot tall and 220lbs, and have never broken a bone only cartilage digit tips. 10 years of basketball, 15 of baseball, four yeara of football in high school so that seemed surprising until all the scans were pulled together and my GP did some specific blood work. Showed him the old family pictures and he confirmed my skull, face, and most of my skeletal structure was much more impact resistant than average at the cost of having some areas of rough and bumpy bone growth. Still works though. So yeah, im pretty satisfied with the mutations i got. I also have the audrey hepburn double row eyelash mutation, hazel eyes, an efficient metabolism and of my 8 great grandparents 6 lived to be 95 or older. Maybe seven but the records are incomplete. So im actually a bundle of decently rare mutations that didnt express catastrophically as some of them have for my ancestors. Apparently nutrition or lack of good nutrition can exacerbate the bone condition especially during adolescence resulting in a very uneven and "melty" face. Modern nutrition staved that fate off for me. Thank you Niacin!

  20. thx for telling me "no body is actually perfect"🤣
    actually i m suffering from the self-contempt. and ya… it's a reason to be ok😆.

  21. synthesizing costs energy, energy that could be used for developing a bigger brain. So losings the ability to produce amino acids and vitamins is an evolutionary advantage. settled humans can easily get all nutrients externally, synthesizing was unnecessary energy consumption and humans that lost the ability to synthesize had an evolutionary advantage and were able to survive more so they reproduced more often and spread their gene.

  22. Why do we evolve as male and female? Why does the body have to lose consciousness (what we call sleep)? Why evolution makes us dream? Why do we get our thoughts from and why do we have intuition? Why are babies born unresponsive and unconscious? What is in our first breath? Is the body a living thing? If yes why does the body lose life? Why some animal succeed in bringing back consciousness in their bodies after a long period of hibernation? Could humans regain consciousness after death? Why do some people remember their past life? Why does the mind still living outside of the body during our sleep? I Stay curious.

  23. Dude
    That ‘Dot and Cross’ thing is not working on me!!
    I tried for 15 minutes
    Still it's not working on me

    Can anyone suggest me how to do it properly…

  24. Try this. For a complex creature to exist a male and female are required (yes sometimes within the same body). Their reproductive systems must match exactly from the physical (which includes the hard-wired species information) to the nerve centre in their brains which has the "software" that drives the mating habits and controls the hardware and nurturing habits. It surely must be agreed that this "kit" cannot evolve over Millenia as it is only viable when 100% complete. So, in the very first instance that a new "kit" appears, say the mammalian "kit", it has to be in a perfectly matched male/female pair in order for procreation to begin. So where does the first pair come from?
    Is it not noticeable how many millions of species of creature have graced this planet and how few basic reproductive "kits" there have been, a mere handful by comparison? This is engineering best practice, a standardisation which can be scaled and programmed to suit many creatures. I am curious as to how such obvious standardisation can appear in the apparent "randomness" of evolution which, it is claimed, has no design, no development, no controlled roll out and no planned end (as these elements would require an outside force) and yet, the final product is always strangely synergistic with whatever situation it finds itself in on land, sea or in the air.
    Evolutionists will tell you that this amazing feat is accomplished by "bad" mutations not surviving, only "good" mutations survive but never tell you how the mutating genes know the difference or why "bad" mutations are produced in the first place.
    Us humans now use in-vitro fertilisation to good effect and can even combine three donors to remove "unwanted inherited traits" which I don't think evolution can claim to do; synthetic biological engineering progression which has no foreseeable limits, indeed, a form of creation.
    Dictionary: "Creation": noun
    1.
    the act of producing or causing to exist; the act of creating; engendering.
    More serious flaws in Evolution:
    https://youtu.be/tok3fReYLsw

  25. I’ve been slacking on taking the big bottle of vitamins in my cabinet, I sincerely paused the video got up and took one after the digestion segment. So thanks for scaring me to take my vitamins again…. Although they do taste awful….. jerk.

  26. HA I hav 20/20 vishin but whenever I wear glasses my vishin gets blurry why?(idk why I’m even commenting XD)

  27. My favorite evelutionary screw up is the recurrent laryngeal nerve, which starts at the brain, misses it's exit, pulls a u turn around the aorta, and comes back up to the larynx. In all mammals. In giraffes this nerve is like 5 meters longer than it needs to be!

  28. viva la genetic engineering! why did i choose masters in electric engineering when my kid dream was genetic engineer… for money ofc. xD
    i wonder if i ll life to see the day humanity engineered their own DNA to have octopus eyes with no blind spot, give our cells the mechanisms needed to produce all the essential amino acids, vitamin C etc. I mean we can even copy paste and adapt, no need to engineer DNA to a degree that we have an additional 4 tentacle arms or something…

  29. So much pain, when I hear this. But if you want to cling to the belief that you are a product of random mutationa and natural selection you're welcome. But don't say, you haven't been reminded that there is another way of seeing things…
    Ignoring possibilities that contradict the own worldview has nothing to do with "being smart", in reality it is a confession that one is not able to look outside the box… (poor people who live inside this box, the whole world is passing by and you don't even recognise it nor know anything about the world outside the box you built yourself…)

  30. Love how we evolved to rely on our eyes as our primary source of interpreting the world around us and yet it still fails us

  31. Actually the guy upstairs is not stupid, just very lazy. He only intervenes when he has to. Otherwise he lets things go in autopilot. Also if you actually do software programming you will see lot of imperfections, very frustrating even when we (the program's God) design them all instead of running code auto generation (random evolution)

  32. evolution is basically a game of poker: you have to play with whatever cards that random shuffling (read: mutation) decides to deal you.

  33. ik denk dat de reden dat wij als mensen zo spim zijn is omdat wij alles moesten bedenken en om te kunne overleven terwijl andere dieren dat niet hoefde

  34. Obviously our DNA is not completely indigenous to this environment here on earth. Our ancestors were alien, but from where, when, how, and why? Things we may never fully know or comprehend.

  35. Thank you for stating a fact rather than a belief. Science doesn't care what you believe or what your opinion is. For those of you who say that I believe in science. I don't "believe". I have a reasonable expectation based on facts and evidence.

  36. I think humans always helped each other, thats why people with broken joints and bad vision managed to survive

  37. So the evolution only works with the things it has and also it create new organs?!! How is it even possible for the first creature to have an eye?!! The eye is not that simple!!! WTF wrong with you ppl.

  38. All body skin parts of animals is haired.
    And all, almost 99 percent humans body skin is hairless.
    That makes humans and apes are very different creations.
    Right?thanks.

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