Bernard Arnault vs. Elon Musk

Arnault apparently wooed his wife, Helene Mercier, a concert pianist, by playing Chopin and other classical composers on the piano. Arnault and LVMH own a 40% stake in private equity firm L Catterton, which has $30 billion in assets, including investments in Birkenstock and Equinox.

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.