Elon Musk was making his own video games.
The Tesla and SpaceX CEO bought his first computer when he was 10 years old. Two years later, he had written a code for a space-based video game called Blastar. Nothing came of the code until this year, when a Google software engineer turned it into a playable video game.
After graduating from Pretoria Boys High in his home country of South Africa, Musk moved to Canada to attend Queen’s University. Following his sophomore year, he transferred to the University of Pennsylvania’s Wharton School of Business.
Mark Cuban got his start selling garbage bags.
Cuban, the billionaire owner of the Dallas Mavericks and a “Shark Tank” investor, started his entrepreneurial career when he was 12. He went from door-to-door selling boxes of garbage bags at a profit of $3 per box.
Garbage bags were just the beginning. For extra money, he sold stamps and coins throughout high school. He skipped his senior year to attend the University of Pittsburgh. After his freshman year there, he transferred to Indiana University and used his business savvy to earn money to cover his tuition and rent.
Jeff Bezos spent his summers castrating bulls in Texas.
Between the ages of 4 and 16, the Amazon billionaire spent his summers at his grandparents’ ranch in Texas. He did work around the farm like repairing windmills and castrating bulls.
When he wasn’t castrating the bulls, he was cooking them as a worker in McDonald’s kitchen. Following a rough summer at the hamburger joint, Bezos and his girlfriend started the DREAM Institute, a 10-day educational summer camp for younger kids.