Elon Musk's first wife explains what it takes to become a billionaire

Justine Musk, the first wife of billionaire Elon Musk, knows a thing or two about wealth and hard work -- her ex-husband is a founder of PayPal and the CEO of Tesla and SpaceX and has an estimated net worth of $12.1 billion. She recently posted a response to a Quora thread asking: "Will I become a billionaire if I am determined to be one and put in all the necessary work required?" Her answer is "no," though she says the Quora reader is asking the wrong question. "You're determined. So what? You...