A MUST SEE.......Last year, rapper B.o.B. used Twitter to jump on the 'flat Earth' bandwagon, and it looks like he's been riding it ever since.

The "Nothin' on You" star has started a GoFundMe campaign to find Earth's curve and see if our planet is actually round (and not a flat disc hanging in space as flat Earthers typically believe).

Earth's curve is a big contention for flat Earthers, who argue that if the earth was round, the "curve" would be more visible to the earthbound human eye.