It's a Battle of the Duds this week on Hard Quiz.Returning are Katharina with her expert subject, penicillin; Matt with the Isle of Wight; Marcus, who's desperate to prove he knows something about dinosaurs; and Kate, who's ready to do backflips once more over Olympic gymnast Simone Biles.Tom Gleeson is ready to take down four contestants foolish enough to have a second try at getting their hands on the Big Brass Mug.

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