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A documentary portrait of the amazing Paul Erdos (1913-1996) via YouTube clips here:
To this day Erdos is the most published mathematician of all time. He was well-known as a traveling math vagabond who would simply hang out with colleagues he had all over the world, after showing up on their doorstep and announcing, "My brain is open," essentially meaning 'hey, let's do some math!' And yet despite many award-winning accomplishments in several math fields he was initially flummoxed by the well-known 'Monty Hall problem.' A fascinating character, whose likes we may never see again.