Oldie, but a goodie. Come spend a couple minutes with Carl Sagan as he explains how Eratosthenes figured out the circumference of the earth and that it truly was a sphere!
The pacing is a little slower than we're used to these days, but it's a relaxing five or so minutes. Rebel against the attention economy for a moment this Friday and indulge yourself.
Some weird Greek guy: "Ah-hah! So you can prove it's not flat, but can you prove we're not sitting on top of a massive turtle's shell? "
Of course it's not on the back of a turtle's shell!
spoiler
There's obviously four elephants between the disc and the turtle
That would explain the spinning, but why don't I hear these creatures doing things like sneezing?
Thunder, genius
Okay but what about all the weird elephant things they do with their trunk like self-fellatio and probing each other's butts? Erasthothenes never accounted for that.
Earthquakes ???