JFK's Cuban missile crisis speech became iconic. But it could have been 'humanity's suicide note'

Some of the greatest speeches not only mark moments in history, they also make history.

For example, it's 10 years since former prime minister Julia Gillard delivered the so-called misogyny speech on the floor of the Australian parliament. Her powerful words 'Not now, not ever' still reverberate around the globe. 

Yet that speech almost didn't happen.