If you have an otherworldly knack for picking the winners of college basketball games, you could get a free ride to Mars on SpaceX's Starship megarocket.
That's the grand prize in the "X Bracket Challenge," a contest organized by the social media site formerly known as Twitter. To win, you have to submit a perfect bracket for this year's NCAA basketball tournament, correctly predicting the winners of all 63 games from the first round to the championship matchup.
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