If you've ever gone deep enough down a Wikipedia or YouTube hole, you know something that many people don't: there are a number of people in the world who believe the Earth is flat. Recently rapper B.o.B. (Airplanes Pt. II, Nothin' on You) tweeted his theories in support of this -- and also that there is a massive cloning conspiracy going on. His tweets drew enough attention to garner a response from astrophysicist Neil deGrasse Tyson, leading to an inevitable pro-flat-earth diss track from B.o.B. Of course, that merited a response in kind, with Neil's nephew (rapping under the name Tyson) dropping 'Flat-to-Fact' this afternoon.