"My dear kitten, '' Albert Einstein wrote, in 1901, to his first wife, the physicist Mileva Maric. "I just read a wonderful paper by Lenard on the generation of cathode rays by ultraviolet light." The romance didn't last. By 1914, Einstein had presented a list of "conditions" under which he could consent to remain in his sour marriage. Among them was a demand to have three meals a day delivered to his room. Read more »