Health and Human Services Secretary Tommy Thompson resigned Friday, warning of a potential global outbreak of the flu and health-related terror attacks. "For the life of me, I cannot understand why the terrorists have not attacked our food supply because it is so easy to do," he said. Thompson, the eighth member of Bush's 15-person Cabinet to resign since the Nov. 2 election, said he tried to leave office a year ago, but stayed through Bush's re-election campaign at the request of the White House. "It's time for me and my family to move on to the next chapter in...