Footprints: How did human feet get washed up on the west coast of Canada and the US?

In August 2007, on an island off Canada’s west coast, the remains of a human foot were found washed up on a beach.Six days later, on another beach 50 miles away, a second foot was found. But, strangely, it does not match the first - they are from different people.The BBC’s Celia Hatton travels to…