The New York Times has called Elon Musk "arguably the most successful and important entrepreneur in the world." It's an easy case to make: He's probably the only person who has started four billion-dollar companies: PayPal, Tesla, SpaceX, and Solar City. But at his core, Musk is not a businessman or entrepreneur. He's an engineer, inventor and, as he puts it, "technologist."

In an interview with Rolling Stone, Elon Musk was asked the following:

Do you believe in God?

I try to let the weight of evidence determine my opinion.

Do you have a spiritual practice?

Not really. I believe in science.

What do you think happens when you die?

I think you cease to exist. I hope I'm wrong in a positive way. But most likely, you're just gone.