The Jewnited States
Superstar
Here is Dr. Carl Sagan explaining how Greek scientist Eratosthenes figured out that the surface of the Earth is curved, deduced that the planet is basically a ball, and calculated very closely how big the ball is, merely by noting the different shadows cast by the sun over a couple of sticks, at the summer solstice.
And did all this in 240 BCE.
pure genius
And did all this in 240 BCE.
pure genius