As any parent can tell you, children grow out of shoes at an alarming rate.
The problem's particularly acute in the developing world where going without shoes can expose children to a host of soil-borne diseases. So what about a shoe that grows along with your child?
Kenton Lee was living and working in Kenya in 2007 when he saw a little girl walking to church in shoes that were too tight for her and had an idea; the Shoe that Grows.
It's an adjustable shoe that can be loosened and tightened with straps to move up 5 shoe sizes. Already thousands of pairs have been handed out in Kenya, Uganda and Haiti.