Eratosthenes, to within 10% of the modern value. They think, I don’t think they’re 100% on the exact size of his measurement unit. Stadia?

Shit… that’s messed up. I mean the whole concept is, but that’s just extra.

I don’t know, it might be a good idea. If you’re involved in a “mass shooting event” you could just drop and play dead.

It looks like it’s flying too. Those ambulatory plants must be FAST!