He first fought in the US in 2005 knocking out Henry Porras in the eighth round.

BBC: McCracken confident of Froch win

None of these explanations answers the question that John Sunderland, chief executive of Cadbury Schweppes, who chaired Mr Porras's lecture, poses.

ECONOMIST: Corporate durability

Lupe Porras, Bristle Comb Pine Forest, Calif.

NPR: Hearing Voices: Opinions on the War in Iraq