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The Hot Line: B.o.B. vs. Neil deGrasse Tyson on whether Earth is flat

January 30, 2016 at 8:00PM

FILE - In this Oct. 10, 2009 file photo, rap artist Bobbie Ray Simmons, known as B.o.B. is pictured on the red carpet as he arrives for the BET Hip Hop Awards in Atlanta. (AP Photo/John Amis, file) (The Minnesota Star Tribune)

« Once You Go Flat, you never go back. »

Rapper B.o.B. insisting that the Earth is flat (seriously), which inspired a Twitter feud with astrophysicist Neil deGrasse Tyson and a B.o.B. diss track, "Flatline." Tweeted Tyson: "Duude — to be clear: Being five centuries regressed in your reasoning doesn't mean we all can't still like your music."

COSMOS: A SPACETIME ODYSSEY: Host Neil deGrasse Tyson arrives on the red carpet during the Screening event and panel for COSMOS: A SPACETIME ODYSSEY in New York City at the Paley Center for Media on Weds. June 4. CR: Cindy Ord/Fox ORG XMIT: 494827177 (The Minnesota Star Tribune)