Do you know anyone with Bum Breath? Is it you? The Geeks look at the mouth, the bacteria, the gases and show you how to self-test for bad breath. Karl and Adam have tubes stuck down their mouths and noses in the name of science, and Karl sets Adam with the cruellest taste-test ever on prime-time TV. Its all topped off with an original song to Bad Breath from JJJ favs Art v Science