The human eye is sensitive enough that – assuming a flat Earth and complete darkness – you could spot a candle flame flickering up to 30miles (48 km) away.
There was a dutch man born in 1912, Mirin Dajo, who willingly had an actual sword thrust through his body multiple times without organ damage. He was taught this method by Indian mystics and performed it in public.
Aristotle believed the heart provided the ability to think, and the brain was just a heat sink for the heart.
Humans are bioluminescent. However, the light emitted by the body is 1000 times weaker than our eyes can pick up.
When a pregnant woman suffers organ damage (ex: a heart attack), the fetus will send stem cells to repair the damaged organ.
There is a weight limit for donating your body to science.
If your immune system received access to the inside of your eyes, it would attack and destroy them as invaders. Similarly, if you damage one of your eyes and it isn’t removed and stays in your eye socket your body will make antibodies against it, which will end up attacking and destroying your good eye. …and this sometimes happens.
You can’t kiss your elbows.