Join or Die with Craig Ferguson

Chris Hardwick, comic Jordan Carlos and scientist Bob Pflugfelder discuss history's worst medical advice.

Courtney Cox, comedian Dan Soder and author/comedian Michael Ian Black debate and discuss history's biggest frenemies.

Guests Elijah Wood, comedian Bryan Callen and Professor Dan Schnur discuss history's most doomed presidential campaign.

Julie Bowen, Dan Levy and Laila Lalami discuss the worst tyrants in history.

Jack Black, Tymberlee Hill and Stephen Prothero talk about crazy cults.

Trace Adkins, Kate Flannery and Lori Greiner talk about great inventions of the past half century.

Lars Ulrich, Tom Papa and Alan Light talk about great rock bands,

David Eisenbach, Maria Bello and Derek Waters talk medicine.

Jay Leno, Mark Forward and Howard Bragman

Adam Goldberg, Noel Wells and Ty Pennington talk great modern mysteries