Here's an interesting bit of perspective. Recounted in this week's Weekly Standard:

After a series of academic succeses at Harvard College, [Robert Oppenheimer] went to England's Cambridge University in 1925 to study physics, but suffered a breakdown. Its most serious manifestation was poisoning his tutor's apple, an act that almost got him charged with attempted murder. Oppenheimer recovered, transferred to the University of Göttingen in Germany, and quickly became a star in the new and burgeoning field of quantum mechanics. Just two years after getting his bachelor's degree, he had a Ph.D. and a reputation as one of the leading young theoretical physicists in the world.