Season 3, Episode 39
Chinese Invasion Alarm
Adam and Jamie investigate an ancient Chinese subterranean sonar system that detected an invasion from below. Then they test related bacteria myths such as a dog's mouth is cleaner than a human's and the classic five-second rule -- if it's been on the floor for less than five seconds, it's safe to eat!
See Tune-In Times
Previous Episode
MythBusters Revisited
Next Episode
Shop till You Drop