Long before he became an inventor, Jon Christiansen was a sea captain. In 1985 he was hired to sail a replica of the Godspeed, the ship that landed at Jamestown, Virginia, in 1607, in a reenactment of the original voyage. One day while he was cleaning the ship’s hull, someone spun the wheel, trapping Christiansen’s leg between the rudder and a support post. The accident severed or damaged most of the nerves below his left knee. Doctors told him he would never have feeling in his left foot again.