Dan was born with two arms, two legs, two eyes, two ears - and four nipples. Now 28, he's determined to get to the bottom of why: what is it that causes one in eight of us, including Hollywood actress Tilda Swinton and singer Lily Allen, to have an extra nubbin or two?
Dan's journey takes him to meet everyone from genetic scientists to a woman in North America who claims to have more than half a dozen extra nipples, including one that lactates.
But his journey ultimately ends up closer to home than he ever could have imagined...
You must enable JavaScript to view comments.
