Is This What It Takes to Be a Billionaire?

Elon Musk is worth $20 billion. He turned 47 on June 28, and he said he spent the full 24 hours of his birthday at work. “All night — no friends, nothing,” he said in an interview with the New York Times. Two days later, he was scheduled to be the best man at his brother's … Continue reading Is This What It Takes to Be a Billionaire?