Self-made billionaires are no joke.   Billionaire Mark Cuban ($3 billion net worth, Shark Tank, Dallas Mavericks owner) dropped by the house today for 4 hours to play some basketball, talk books, and share some future trends to invest in.  I counted how many genius things he told me. It was 19 different points. He's a damn smart man - one of the most observant and aware people I've talked to in a long time.   His reaction when I asked him how it felt to become a billionaire cracked me up, haha.   One powerful point is that you only have to win once. Then everyone will forget your past mistakes. So true...