How We Know The Earth Isn’t Flat

Rapper B.O.B thinks the earth is flat, but how do we know it isn’t?

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Flat-Earthers are back: 'It’s almost like the beginning of a new religion'
https://www.theguardian.com/science/2...
“YouTube user TigerDan925 shocked his 26,000 followers recently by conceding a shocking point: Antarctica is a continent. It’s not, as he previously thought, an ice wall that encircles the flat disc of land and water we call earth.”

When I stand at the water's edge and look out over the ocean, how far away is the horizon?
http://science.howstuffworks.com/ques...
“One of the funniest things about the ocean is the fact that its surface is curved. We tend to think about water forming large flat sheets, but the surface of a large body of water is not actually flat at all -- it follows the curvature of the Earth.”
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