For several days, bloggers and journalists have been passing around a news story about how the BP oil disaster will unleash a "giant methane bubble" and initiate a mass extinction. Yes, it's a myth. And we've busted it.

GNC's "tri-pepper blast" diet pills burn as many calories as a 20 minutes walk. Except the study "proving" this was funded by GNC itself. So what's the real story behind these numbers? Should you buy these pills to lose weight?