We learn from a professor who actually teaches a class about identifying B.S., and we talk to a researcher who made a fascinating discovery about... pee. Plus: late night legend Jay Leno joins us to take our personality test.

Do I Need A Bath?

Paula Poundstone is on a quest to gather all of the world's knowledge. Or, as she puts it, "to get less stupid, one topic at a time." Follow her search as she looks to scientists, researchers, and experts for evidence about everything from what music cats like to the fluid dynamics of spilling coffee. "Every week, we'll keep looking for knowledge," says Paula, "because we know we left it somewhere."