Back to school time for over five million students heading back to classes means the air will be filled with knowledge, but research has also revealed the air may also be filled with odors and many of them are not pleasant. You might think that the students lack of hygiene may be to blame but there's more to the story. To tell us more about the research behind the stink, Jason Tetro, an Edmonton microbiologist and author of The Germ Files, joined Russell.

Hello Jason!