This spring, we'll be having a little March Madness of our own here at mentalfloss.com. Instead of playing hoops, though, we'll be working to put the title of "History's Greatest Genius" on its rightful owner. To find this singularly great thinker, we're having a single-elimination tournament to settle the debate about humanity's greatest mind once and for all. Is it Albert Einstein? Sir Isaac Newton? Evel Knievel? (Every tournament needs its Cinderellas.) The winner will be crowned on April 6th!