Henry Louis Gates revealed Sunday that he has had to change his email address and telephone number after receiving numerous death and bomb threats, including one email that read "You should die, you're a racist." Harvard officials have also suggested that he move homes since his arrest by a white officer sparked a national debate on race. But Gates said he can now joke about the incident. He said Sgt. James Crowley looked relieved when they shook hands at last week's "Beer Summit" with President Obama. "I said to him, 'I would have sworn you were 6-feet-8 inches tall,'" Gates said at the Martha's Vineyard Book Festival, where he was representing his latest book. "He said, 'I used to be, but I've lost 2 to 3 feet over the last two weeks.'" Gates said he and Crowley might meet up again for dinner or a Red Sox game.