An anonymous reader wrote to mention an MSNBC article on how Darwin and Einstein managed their inboxes. From the article: "A new study finds that the correspondence of Albert Einstein, as well as that of Charles Darwin, followed patterns similar to modern e-mail communication. Einstein sent more than 14,500 letters. But he received more than 16,200, and responded to only a quarter of them. Darwin mailed more than 7,500 letters. He responded to 32 percent of the roughly 6,530 letters he received."