In the 1960s, Bob Moore read a book about an old grain mill and was inspired to start his own. Using giant quartz stones from the 19th century, he made dozens of different cereals and flours, positioning his company at the forefront of the health food boom. Today, Bob's Red Mill has grown into a $100 million business – and at nearly 90, Bob goes to work at the mill every day. PLUS, for our postscript, "How You Built That," how Mike Bolos and Jason Grohowski created the portable desk, Deskview.