Muhammad Ali faced George Foreman in one of boxing's greatest showdowns over 50-years ago in a clash billed as 'The Rumble in ...

Other animals bite, claw, butt or stomp one another, but only the species that includes Muhammad Ali folds its hands into a fist to perform the quintessential act of intra-species male-on-male ...

Foreman's fist is photographed in the lead-up to his title fight with Muhammad Ali in 1974. Foreman was known as one of the most powerful punchers in history. Monte Fresco/Mirrorpix/Getty Images ...