Bobby Ray Simmons Jr., better known as the rapper B.o.B., once scored with a song titled “Out of My Mind.” Astrophysicist Neil deGrasse Tyson Tyson would agree. On Monday, Tyson and the 27-year-old singer entertained Twitter with a debate over whether the earth is flat. (Tyson has 4.81 million followers to B.o.B.’s 2.29 million.) Joining […]