"As a child, R. A. Fisher was fascinated by mathematics, statistics, and astronomy. His vision was severely impaired, but this was no impediment to his scholarship: He had tutors who would read mathematics to him, and young Fisher would picture the problems in his head. He eventually became so good at visualizing the solutions that he would frequently present his answers with absolutely no proof, saying that the solution was so obvious it didn’t need to be proven. Gosset remarked that these ‘obvious’ solutions to problems were generally not obvious to anyone else until they’d slogged through the math and could see on paper what Fisher saw in his head."