The MythBusters take a pot shot at an ancient Chinese text that alludes to a subterranean sonar system that could apparently detect and intercept an invasion from below. And watch Adam and Jamie test out a myth that millions of hungry Americans invoke every day — if it's been on the floor for less than five seconds, is it really safe to eat?
Episode number: 3x22 Airdate: Wednesday October 19th, 2005
Adam: (Referring to the sandwich that Adam dropped on the floor) I dropped this on the floor, then picked it up after three seconds. Would you eat it? Jamie: I wouldn't eat it just because you handled it!