An investigation exposed that the Pentagon, and taxpayers, get taken advantage of by U.S. defense contractors. Bill Whitaker sits down with a former top contract negotiator who says the accountability system is broken. Cyber con artists are using artificial intelligence, apps and social engineering to scam Americans out of $10 billion dollars a year. Sharyn Alfonsi reports. Famous for his giant sculptures, Jeff Koons holds the record for the highest price ever paid at auction for a work by a living artist. He shares his next big idea with Anderson Cooper.

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