This matchup has seemed inevitable since we released the brackets, hasn't it? We've already filled you in on what each of these geniuses accomplished, but it's worth running through the list one more time before you decide who should take the title.
Einstein's output in 1905 alone was enough for an entire lifetime of work. In that "miracle year" he published four papers that altered humanity's understanding of physics. One explained the photoelectric effect, while another offered an explanation for Brownian motion and the first experimental proof of the existence of atoms. The third and fourth papers laid out his theories of special relativity and his famous "E equals MC squared" formula. Any one of these papers would have been an incredible Nobel-worthy triumph, and he banged out all four in a single year. When early Nazi propaganda targeted Einstein and the "Jewish physics" of relativity and forced other scientists to renounce relativity, he fled to the United States, where he eventually helped convince Franklin Roosevelt to develop the atomic bombs that would end World War II. Later in his life Israeli officials offered Einstein the presidency of their country, although he declined.
Leonardo, for his part, was just as busy. The Renaissance man felt that it was his duty to take in as much knowledge as he possibly could, so he threw himself into all sorts of studies. Works like his Last Supper and Mona Lisa show his artistic virtuosity, particularly his mastery of smoky shadows, but it's his scientific and engineering work that really sets Leonardo apart from the crowd. When he died, Leonardo left hundreds of pages of journals detailing his observations on all sorts of natural sciences, including botany, anatomy, and zoology. His architectural studies were far-reaching and diverse, and his engineering sketches proved to be well ahead of their time, particularly his designs for flying machines, tanks, parachutes, and an early forerunner to the machine gun. Leonardo may not really have only slept for 15 minutes at a time, but with accomplishments like this, it's easy to see how that urban legend could spread.
Which one are you going to pick as your top genius, though? Einstein, the scientific powerhouse who won the Nobel and has given us fodder for countless magazine covers? Or do you like Leonardo, the brilliant artist who managed to learn a little bit about almost everything else, too? They're both great, but there can be only one champion.
[See the whole bracket here.]