What's an interesting fact you learned recently?

I'm reading a really interesting book on native American culture and history. It's gone into how brutal some tribes could be, horrifyingly so. For example if a person was captured they could literally be worked to death, given regular beatings and torture eg their nose being burnt off. Had no idea!

Humanity is in the overshoot phase, and will suffer a population collapse within 200 years.

You can directly burn non-ISO9660/UDF File Systems on optical media (CD/DVD) and use squashfs to transparently compress data on the disc.

The first documented Roman encounter in Scotland had a random woman mouthing off the Roman empress at the time about how she could screw better than her.

I had learned that CS Lewis died within minutes of the JFK assassination.