An expert is a person who has found out by his own painful experience all the mistakes that one can make in a very narrow field.

— Niels Bohr, Dr. Edward Teller's Magnificent Obsession (1954)

Source: http://books.google.de/books?id=I1QEAAAAMBAJ&pg=PA62

Quoted by Edward Teller in Robert Coughlan's LIFE magazine article (1954).

Topics: learning