Rapper B.o.B. who has such huge hits like "Airplanes" and "Nothing on You" tweeted out that he believes the world is still flat. Yeah, he still believes the world is flat and his reasoning is just ridiculous. Renowned scientist Neil DeGrasse Tyson fired back that his facts are pretty much 5,000 years old. Then B.o.B. who apparently has a lot of time on his hands, because he hasn't released an album in like four years, fired back at Neil DeGrasse Tyson with a diss track called "Flat Line."  Which isn't that great of a diss track anyways, but then the scientist came back with force.

Last night on The Nightly Show with Larry Wilmore, Neil DeGrasse Tyson called out B.o.B. and pretty much laid down the cold hard scientific facts. This is great. Watch and enjoy.

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