Blake Mycoskie started and sold four businesses before age 30. But only in Argentina did he discover the idea he'd want to pursue long term. After seeing a shoe drive for children, he came up with TOMS — part shoe business, part philanthropy. PLUS for our postscript "How You Built That," we check back in with Dillon Hill, who built Gamers Gift to help bedbound and disabled patients enjoy a wide range of places and experiences through virtual reality.