Most, if not all, of the Challenger astronauts were alive and conscious as they fell into the Atlantic.

Pyroclastic Flows. Where cascades of super-heated gases and debris fall from the side of a volcano. The gases are so hot, that if you are caught in one your brain literally boils and explodes out of your skull.

Ducks have horrifying corkscrew-shaped penises.

There are billions of formally dressed corpses buried underground

Most open grassy areas (ie parks) in London, are in fact plague pits from way back when.

Everyone knows, even by instinct, that inhaling water is bad. What most of us don't know is saltwater and freshwater both drown you from suffocation, but the process on a chemical level is very different. When ocean water enters your lungs, your body attempts to regulate the high salt content. Blood will enter into the lungs and thicken because the salt cannot be absorbed into the bloodstream. The process is very different from freshwater, where the water in the lungs can be absorbed into your bloodstream. When the blood cells attempt to absorb too much water at once they burst, leading to a quick death. But what about salt water? What happens to you while your blood thickens? Well, the good news is that salt water takes longer to kill you, leaving more time to be rescued. It also means you may stay conscious up to the point when you die, about ten minutes after the moment when you first inhaled it.

Your brain is actively editing your senses. Ex: You can always see your nose. You have a blind spot in your vision but your brain fills in the missing data.

Pigs will eat anything, even people.

The human body can be drained of blood in 8.6 seconds given adequate vacuuming systems.

During a severe asthma attack, your airways close so significantly that no air can move through them. You're left heaving violently with all your breathing muscles to desperately get to the air locked outside your body until you eventually fatigue and die.

A bamboo shoot is strong enough to penetrate flesh.

Only 1.3% of the uranium in little boy (dropped on Japan) caused a nuclear fission, the rest was blown away. Less than a gram of uranium killed thousands.

The placenta of a woman that smoked during pregnancy smells like wet carpet.

The rectum is nightmarishly elastic.