to be fair it was more than 1 stick

2 sticks

When I was a kid my teachers told me that Christopher Columbus discovered the earth was round and that before him everyone thought it was flat. When I was about ~13 I read a short biography of Eratosthenes and it blew my little mind.

Sagan did a bit on this.

https://www.youtube.com/watch?v=G8cbIWMv0rI

There were also wells and a lot of walking involved.

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