At a recent concert, the 50-year-old Sheryl Crow told the audience that she has a brain tumor. *In best Schwarzenegger voice* It's not a tumah! I mean, it is a tumah! Don't feel bad for Sheryl though. While it sounds like it's pushing up on her brain like a creepy guy's crotch on a girl's ass in a club, it's not going to kill her. Though it won't let her see into the fourth dimension either. The tumor ...