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Geometry

16/18Stephen Fry tackles geometry with David Mitchell, Rob Brydon and Johnny Vegas.

15/18Stephen Fry goes all green with Jeremy Clarkson, Bill Bailey and Danny Baker.

14/18Stephen Fry gets to grips with Greeks, with Clive Anderson, Phill Jupitus and Rich Hall.

13/18Stephen Fry goes Gothic with Sue Perkins, Jimmy Carr, Jack Dee and Alan Davies.

12/18Stephen Fry tackles gravity, with Barry Humphries, Bill Bailey, Rich Hall and Alan Davies.

11/18Stephen Fry gives gifts, with Jan Ravens, Jimmy Carr, Clive Anderson and Alan Davies.

10/18Stephen Fry tackles the greats, with Jo Brand, David Mitchell, Sean Lock and Alan Davies.

9/18Stephen Fry is joined by Phill Jupitus, Hugh Dennis, Andy Hamilton and Alan Davies.

8/18Stephen Fry gladly gravitates towards Germany, with Jo Brand, Rob Brydon and Sean Lock.

7/18Sandi Toksvig, Ronni Ancona, Jack Dee and Alan Davies grapple with Girls and Boys.