What fun, lesser known, or plain interesting fact can you diss up?

Something that you’ve learned recently, and that made you go “wow!”
Or something you already stored twenty, thirty, fourty, fifty years ago, but can recall very vividly because of its rarity?

The Arctic has polar bears, Antarctica has not.
Arctic comes from arktos which is Greek for bear.
Anti-Arctic (Antarctic) is the opposite of Arctic.
And coincidentally there’s no bears there.

I learned about anti for the first time when we travelled from Patras to Athens, by train, and we passed a modern bridge, called the Rion-Antirion bridge, which connects Rion with Antirion (which, you guessed it, means “opposite of Rion”.