@phaedral
He was a 17-year-old kid who lost his two best friends, and he learned from that experience better than most adults I know (and certainly better than I have from my own mistakes):
"I’ve been risk-averse in other areas of life ever since, too. I drive the speed limit. I obey the seatbelt sign on airplanes. I invest in index funds."
His book _The Psychology of Money_ is filled with excellent advice