Carl Sagan: How the circumference of the Earth was calculated using only sticks, eyes, feet, and brains

The main thing to take away is that our ancestor would start this experiments like this:
“I believe X to be true/false, can I find out which one it really is?”

Now a lot of people today start these experiments with:
“I believe X to be true and will try my hardest to find ways to convince other people that it is so”

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