The word 'mortgage' comes from a French law term that means 'death pledge'.
14
If two pieces of metal touch in space, they become permanently stuck together.
808
In zero gravity, a candle's flame is round and blue.
16
Parrotfish make themselves a kind of mucus 'sleeping bag' which masks their smell from predators and keeps parasites away.
4
Poor eyesight (myopia) is associated with higher IQ.
232
Some monks can increase their body temperature so much they can dry soaking sheets in a freezing room!
31