The 'Today I Learned' thread...

I made this thread so people can post whatever random but interesting shit they learned and want to say, but wouldn't make a single thread for what you learned.
Format would be ''TIL....''
Example: TIL Steve Jobs was half Syrian.

The difference between a male and female fruit fly, and the phenotypes on certain fruit flies. I also discovers one that has a genetic mutation.

Absolutely nothing

They are selling SSGSSJ goku figure

TIL that the last Byzantine Sassanian war was in 628