John Forbes Nash Jr. was a brilliant mathematician and a suffer of something, depending on whom you ask, in the neighborhood of schizophrenia and manic depression. Nash, who died in a car accident with his wife a little more than a week ago, was, first and foremost, a Nobel laureate, whom, like many mathematicians, made his greatest discoveries in his 20s (As G.H. Hardy wrote in 1940, of “all the arts and sciences mathematics is the most remote” and “no mathematician should ever allow himself to forget that mathematics, more than an other art or science, is a young man’s game”). Knowing that history and those peculiarities of mathematics and mathematicians, strange behaviors –extended solitude, writing equations on walls, a frenetic pace to develop solutions, mumbling to themselves in public – probably did not seem so far outside the norm among his brethren at Princeton University. But, according to a 2010 edition of The Princetonian , the daily newspaper at Princeto...