40 UNREAL Facts About Your Body

Listen to my podcast, @DoctorMikeCheckup, here:

There are so many videos across YouTube boasting long lists of “facts” about the human body. These videos use catchy thumbnails to draw in millions of views and rake in profit. Unfortunately, almost none of these videos actually provide sources or do any fact-checking whatsoever on these claims, resulting in misinformation spreading wildly. It’s time to put an end to that. I culled a list of 40 facts about the human body and had my producer and a medical resident verify their legitimacy. Every fact here has been verified by scholarly articles, peer-reviewed studies, or specialists. I’m talking facts on fingernails, vestigial body parts, teeth strength, tongue prints, liver functions, sixth senses, pregnancy brains, eyelashes, saliva, blood vessels, the heart, sperm, eggs, and dozens more! Oh, don’t forget to check out the sources here:

I LOVE reading your comments and take your suggestions seriously. If there’s a subject you want me to discuss or something you’d like for me to react to, leave a comment down below. Many of my videos have been born out of suggestions directly from you, so don’t hold back!
-Doctor Mike Varshavski

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* Select photos/videos provided by Getty Images *

** The information in this video is not intended nor implied to be a substitute for professional medical advice, diagnosis or treatment. All content, including text, graphics, images, and information, contained in this video is for general information purposes only and does not replace a consultation with your own doctor/health professional **

[marlorulon]

This was incredible… I love learning about the body… I now want 1, 000, 000 facts

[cnusn]

Other marketers: Advertises on Google.

Google: Advertises on Doctor Mike

[jaclynclarke]

I was diagnosed with acute lymphoblastic leukemia at 13. When my surgeon was placing my port, he hit my lung and it collapsed. The pneumothorax pushed my heart to the other side of my body which is how it was initially detected. The fact that this happened and I was able to survive, albeit with blueish lips and fingernails, is amazing. Also I beat cancer so peewoop!

[finleynedelka]

I'm allergic to water and have been since I was really young. Every time I tell people this they tell me I'm lying or say "then how do you drink it?" It's annoying. I LOVE seeing Dr. Mike talk about this!! He makes so many people, including myself, who have things no one really talks about feel seen!! Peewoop!

[jakespiegler]

His sponsor is Google😂. The only company that doesn’t need to advertise because they’re already a verb

[axmhp]

Seeing an ad for google search is like seeing an ad for breathing 😅

[SilverDragonJay]

"your pinky is responsible for 50% of your hand strength"
very well timed fact, as I was using my pinky at that very moment to stabilize my mug to take a drink. I tried doing it a second time without my pinky and I almost spilled my tea. I already knew that the pinky was actually pretty important for grip strength and stabilization (sometimes I just pick things up and focus on how my hand is doing it; the body is neat), but I didn't realize it accounted for so much.

[solexsahara]

0:41 “you actually have a 3rd eyelid”

Me: *but where is my second one???*

[aslahyasar]

Doctor Mike: Ads for Google in YouTube
Google: I literally own this place.

[emeraldyt]

Man’s got a google sponsorship. I’ve literally never seen that

[edenmartinez]

I actually learned about the other senses through my tattoo apprenticeship!
Nociception was the most important fir me (obviously understanding the physiological processes that directly affect my ability to do my job is good practice) it was really cool learning about different pain preceptors in your skin and how different shapes are responsible for different forms of pain, pressure, and temperature sensations you feel throughout the tattooing process.
V interesting stuff!

[matrix]

So grateful for doctors. Thank you Doctor. Mike for educating society.

[DoctorEyeHealth]

Thanks for mentioning some good eye stuff!!

[SwiftKey_]

the fact that he got 40 facts + a google sponsor together in 7 minutes is just amazing!

[evinhale]

I was diagnosed with hot water urticaria about 2 years ago when I was 12 i mainly get hives when I do physical activity or shower with hot water. it’s very annoying to have to take room temperature showers instead of hot showers. But then again this could have been a congenital thing since when I was born I was covered in hives, my temperature was about 100 degrees, and it was very humid in the hospital (which I find is another thing that causes my hives). It took doctors 3 weeks for them to let my mom take me home.

[adamandkathlynmiller]

Love the content Mike! I have really enjoyed these list videos recently.

I don't know if your video crew will read this comment, but they can squeeze the teleprompter text closer together to make it look like you are not reading your copy. The wider the text on prompters, the more the eye moves horizontally to read it...and even these little movement are picked up by the camera. Most prompter software has a "margin" setting to place blank spaces either side of the text. Just a helpful hint from someone who does quite a bit of prompter work.

[dabolife]

It's amazing how I feel comfortable learning new things here everyday while I was so lazy at school. Thanks Doctor Mike

[nagranoth_]

Never thought I'd see the day where Google feels the need to advertise for their search engine...

[Setanta]

Proprioception is, like you said, achieved through several mechanisms... two of which are muscle and tendon proprioceptors. In the muscle tissue there are "muscle spindles" which inform us about the length of muscles (thus a muscle stretch receptor). They give a signal if a muscle is being stretched out too much (and thus damaged/torn). In the tendons (adhesion between muscle and bone), there are "Golgi tendon organs" which inform us about how much strain there is on a tendon. The more strain, the heavier the muscle is contracted, and the more force is on the tendon. Therefore these Golgi tendon organs act as tendon stretch receptors. Therefore the receptors can give signals if the muscle is being contracted too heavily. This can be dangerous because (I have not fact-checked this) a muscle contraction that is too powerful, can actually break bones.
Another cool fact about proprioception is, that the fluid in the ear canals (the semicircular ducts, in the vestibular system) react heavily on temperature changes. Filling an ear with warm water can actually heat up some of the fluid in these ducts (I have experimented with this in med school). And we all know that warmer things have a lower density, so this warmer fluid will start moving upwards, and the cold fluid will descend in the ear canals (due to gravity). This movement of fluid normally indicates movement or rotation of the head. So when you fill an ear with warm water, it can create the sensation of moving the head; and I think it even goes so far that (can't remember this exactly, med school was too long ago; have not fact-checked this either), if you fill one ear with warm water and don't do anything with the other (so that the fluid will remain still), it can create the sensation of dizziness.
Ánd.... (learnt this in med school/bachelor's biology) the abovementioned semicircular canals are álso involved in the vestibulo-ocular reflex. This means that movements of the head, and thus fluid motion in the ducts, instantly affect the eye muscles, and thus cause the eye to rotate. This even happens when a person is blindfolded. This shows that the reflex is not purely affected by what one is seeing, but rather what the vestibular system is telling the brain. So in conclusion; whenever the ducts' fluid flows, the eyes move as well. This serves to maintain a stable image of what you're seeing/reading on the retina, even if you move your head (try it; shake your head while reading this post and you'll see that you can still read it. You can thank your vestibulo-ocular reflex for this).

[yasmin]

The pinky finger one was amazing for me. I have - on both hands - congenitally crooked pinky fingers where the skin on the inside is too short (there is a medical term for it, I cannot remember it anymore). I still kann move and use my pinkies but not make them completely straight. That is why I never realized they are actually strong fingers and very useful - I tend to not use them unless I am using the whole hand.