"Twin Reversed Arterial Perfusion Sometimes identical twins that share a placenta end up with their umbilical cords connected artery to artery when they begin development. What then happens is whichever one has the first/stronger heartbeat (the pump twin) pumps their deoxygenated blood backwards through the other twin (the TRAP twin) before finally returning to the placenta for more oxygen. The pump twin goes on to develop normally but the TRAP twin is only supplied with oxygen-poor blood and ends up only developing whatever is closest to where the umbilical artery enters the body: legs and intestines. They have no brain, no heart, essentially no upper body at all since they use up whatever oxygen enters their body before it can reach those organs. They're just a blobby extension of the pump twin. It's dangerous for the pump twin since their heart is pumping through a whole extra circuit and has a tendency to fail. Nowadays fetal surgery can be done by poking a laser into the amniotic sac and cauterizing the cord of the TRAP twin, which cuts off the blood flow and forces the pump twin to reroute their faulty artery back to normal. It just kinda sits in there until the baby is born and it comes out with the placenta. This can happen in other animals as well, like cows. They'll end up birthing a little cowskin pillow along with a normal calf. You can look up TRAP twin but it's obviously medical gore and nsfw." - rahyveshachr https://www.reddit.com/r/AskReddit/comments/wg51yv/whats_the_weirdest_scientific_fact_you_know_that/

"There are some cases where young children have had to have up to half of their brain removed due to some severe condition. The children were still able to live almost normal lives because the remaining parts of the brain took over everything the removed parts did." - veterangunslinger

"The acids in your stomach denature proteins. Which is the same thing that heat does to eggs when you cook them. So if you eat a dozen raw eggs, you will vomit scrambled egg." - snapwillow

"Bedbugs mate through Traumatic insemination. This the mating practice in some species of invertebrates in which the male pierces the female's abdomen with his aedeagus and injects his sperm through the wound into her abdominal cavity. The female has no vaginal opening, and this is the only way they reproduce." - MisterLicious

"Female ferrets die during heat if they don't mate." - Arietis1461

"We live closer to the time of T-Rex than they lived to Stegosaurus." - 2021Blankman

"If your lungs were filled with oxygen enriched liquid you wouldn't die from it. What will kill you is the carbon dioxide buildup in your body." - Jigsaw_isnt_a_puppet

"Cuttlefish can change the color of every scale on their body, as well as contort into various shapes and sizes, meaning they are practically shape shifters. They also passed an IQ test last year. Luckily they use their shape shifting powers to hypnotize crabs and eat them." - f---thezodiac

"When two cultures with different languages are forced into contact with one another and a common tongue is necessary, a proto-language called a pidgin will form as a means of communication. Pidgins often don’t have uniform grammatical structure or the rules that govern a typical language and a limited vocabulary. The children raised by speakers of a pidgin DO create these types of structures and consistency (as well as make the language more extensible to enhance vocabulary) essentially giving it the properties of a typical language. This happens because our ability to create language is hardwired into our brain from birth." - itsabouttimsmurf

"Humans are evolving a third artery in their hands/arms. During early development we have a third artery running down our arms called the median artery, running inbetween the ulnar and radial arteries. It usually disappears again after we are born. But in the last hundred years the amount of people who still have it as adults have gone from roughly 10% to over 30%. It does add extra bloodflow to your hand, increasing dexterity. But it also puts you at higher risk of carpal tunnel syndrome.." - Nisseliten

"The placenta is the only organ not native to the body that doesn't get rejected without immunosuppressant drugs and scientists are studying it extensively to find out why this is to help organ transplant recipients not suffer organ rejection." - averyyoungperson

" Stars are extremely loud. You just can't hear them because sound can't travel through the vacuum of space." - KingdaToro

"Wombat poop is cube shaped." - WoolaTheCalot

"The iron in your blood was forged in a supernova." - mformandar

"The lobotomy won a Nobel prize in medicine as a miracle cure. More than half of lobotomy patients were women, and in some countries most were children with behavioral issues." - SailorVenus23

"People with ADHD have something called "low pain perception." It basically means that their brain cannot reliably process pain signals, resulting in delayed pain responses (sometimes to the point that they won't feel pain until they've visually confirmed they are indeed injured), disproportionate intensity of pain (either feeling it less or more than neurotypical individuals), inconsistent responses to pain (able to eat spicy food no problem one time but then being overwhelmed by the same level of spice at a different time), or just not feeling pain from injuries at all." - Electrical_Age_336

"White holes are theoretical cosmic regions that function in the opposite way to black holes. Just as nothing can escape a black hole, nothing can enter a white hole." - Back2Bach

"I don't know if this counts as "scientific", but the Birthday Paradox always gets me. If you're in a room with only 23 people, there is at least a 50% chance that one of them shares a birthday with you." - mattscrappy

"Whenever you think you see something in the corner of your eye but turn to look and see nothing there, always remember that our vision goes off of light and reflection. We can see certain things more clearly if in front of us, moving, or reflecting light back into our vision. So, when you look but don't see anything, keep in mind that there was something probably there... Just not reflecting enough light back for you to see it. Unless you're schizophrenic, than ignore this fun fact" - Gene_Best

"It would take less than one teaspoon of neutron star to equal the mass of the Great Pyramid." - Thirty_Helens_Agree