Alice Walton vs. Elon Musk

After graduating from Trinity College in 1971, Walton briefly worked for Walmart as a buyer of children's clothes. Her art collecting career began when she was 11 and bought a 25-cent print of Picasso's "Blue Nude".

Musk, who says he's worried about population collapse, has nine children with three women, including triplets and two sets of twins. As a kid in South Africa, Musk taught himself to code; he sold his first game, Blastar, for about $500.