Einstein: His Life and Universe

by Walter Isaacson

“The more successes the quantum theory enjoys, the sillier it looks.”

“Those are the madmen who do not occupy themselves with the quantum theory.”20

Einstein’s humor stayed intact through it all. Among the letters he received in England was one from a man who had a theory that gravity meant that as the earth rotated people were sometimes upside down or horizontal. Perhaps that led people to do foolish things, he speculated, like falling in love. “Falling in love is not the most stupid thing that people do,” Einstein scribbled on the letter, “but gravitation cannot be held responsible for it.”76 Einstein’s main appearance on this trip was a speech on October 3 in