The uncertain future of computers and software led Microsoft's Bill Gates to explore other career paths — including becoming a politician.

In his new book, Source Code, Gates recalls a unique childhood that led him to build a technology empire. We talk BASIC, old PCs, Microsoft's future, and AI's promise and perils.

It's towards the end of our interview that Bill Gates reveals new numbers on how much his charitable Foundation has now spent in its efforts to combat preventable diseases and reduce poverty. "I've given over 100 billion,

Consider including this question in a New Mexico-centric trivia contest: What New Mexico city saw the start of a software company that eventually became an industry giant? The answer? Albuquerque. The company?

Bill Gates' anxiety over tech rivals caused him to constantly worry about Microsoft's demise, even years after it became one of the world's biggest companies.

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