Urine was used for teeth whitening and bleaching of clothes in Ancient Rome. Yes, they rinsed their mouth with human AND animal urine.

The search and rescue dogs on 9/11 were getting so sad from finding only deceased bodies, the human helpers buried themselves in the rubble so that the dogs could find them and be happy.

People with extreme scurvy start to have ALL of their old wounds open up. Everything with a scar is held together via an active process with collagen and without vitamin c just sort of...stop.

There are more deaths due to mental health issues than all forms of violence combined. People are struggling.

The image that most people have of blobfish is based on a misconception. people think that’s what they look like all the time but blobfish adapted to live in deep waters, which means the deeper you go, the more water pressurethere is. Their bodies are not meaty like fish but more gelatinous because they adapted to the water pressure. if you accidentally pull them to higher levels but with less water pressure, their bodies don’t handle it well bc there’s nothing keeping their bodies in tact, so their bodies explode. Basically, every photo you’ve seen of a blobfish where they look big and pink and, of course, blobby is a photo of a dead blobfish. Merchandise and cartoons designed after what they look like dead. Hell, they’re referred to as what they look like dead.

You can smell your own lungs. Your brain just filters out the smell.

Spider - Rain (you read that right) is a real and naturally occurring phenomenon.

A blue ringed octopus, found in the Pacific, is a tiny and cute little guy, but one painless bite gives enough venom to take the lives of 25 male adults.

There is a (genetic) disease called FOP where your muscles and tissue turn to bone. Often called "human statue disease" Eventually people may have to decide whether they want to become "frozen" in a sitting or flat/standing position.

Horses can't throw up. So if they eat something bad or get a bad gas bubble, they just lay down and die.

If 2 male flat worms meet, they will sword fight with their penises until one loses. The loser will become female and they will mate.

Quokkas, the worlds happiest animal, will throw their babies at attackers if threatened.

Migraines and strokes carry a lot of the same symptoms so if you suffer regular migraines you may not notice you're actually dying one day.

There is a non-zero maximum threshold for the amount of cockroach that can be present in ground coffee because it is literally impossible to keep them out entirely.

A man once had a tapeworm get cancer. That cancer metastasized, and the man passed away from tumors of tapeworm throughout his entire body.

A third of the world's population live in areas that are projected to suffer extended periods of unsurvivable heat by 2070.

Most power outages in the US are caused by squirrels.

It was once thought for birds (parrots, magpies) to learn to talk, you had to release their tongue. This was done by cutting their tongue completely or partly off, of course without any anesthesia or pain killers. The tongue release plays absolutely no role in the birds' ability to talk.

The reason dogs love squeaky toys is because they sound like small animals dying.

If you are an identical twin it is possible that you and your siblings identity’s were swapped and your parents never caught it.

Sloths only have enough energy for their weekly toilet trip to the jungle floor. If the baby falls from their underside in the trees onto the floor, they choose to preserve their energy and leave it to be eaten.

The threat of a deadly bird flu spreading to humans is always there. It takes just a little bit of negligence in screening chickens for this to happen.

If you eat a polar bear liver, you will die. Humans can't handle that much vitamin A.

In Australia there is a plant called the Gympie-Gympie which has such a severe sting that horses who brush against it throw themselves off cliffs because they’d rather die than continue to experience the pain

During ww1 thousands of dogs were taken from families for the war effort and when the war was over most of them were just shot because it was cheaper than feeding them for the trip home and finding their homes.

Oftentimes when Pandas have cubs, if they have more than one they will choose which one to keep and abandon the other because she can’t care for two. Grizzlies are the opposite. If they have a litter of just one, sometimes they’ll abandon it and try to mate again the next year to try for a litter of multiple cubs :(

The FDA allows a tiny amount of things like rat droppings or insect parts in certain foods.

Climbing Mount Everest has a 6.5% mortality rate. What's more harrowing is that if you die, you will most likely be left there. There's currently over 200 dead bodies on Everest that are irretrievable, and now serve as markers for other climbers. Not a bad place to eternally rest, but upsetting for those left behind who can't give you a proper burial.

There are Demodex mites crawling on your eyelashes right now, and there's NOTHING YOU CAN DO ABOUT IT.

Bus seats are designed so that you cannot tell how dirty they really are.

The youngest person to ever give birth to a baby was a 5 year old little girl.

If a female hamster gets too stressed, it will eat its kids.

There are 8 unaccounted for American nukes and literally an unknown quantity of missing soviet nukes that range all the way from warheads to suitcase bombs.