The Man Who Stopped the Spammers

By the year 2000, the internet was already becoming a cesspool. The bad guys used software bots to sign up for millions of fake email accounts—for sending out spam. PhD student Luis Von Ahn stopped them. He invented the CAPTCHA, that website login test where you have to decipher the distorted image of a word. Or you have to find the traffic lights or fire hydrants in a grid of nine blurry photos. Those tests help to keep down the volume of spam, spyware, and misinformation; they advance the clarity of digitized books and the intelligence of self-driving cars; and, by the way, they made a handsome profit. The only problem: We HATE those tests! Guest: Luis Von Ahn, co-inventor of CAPTCHA, co-inventor and CEO of Duolingo. See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

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Hear the untold stories of mind-blowing achievements in science and tech. “CBS Sunday Morning” correspondent and six-time Emmy winner David Pogue takes you behind the scenes into the creation stories of the world’s greatest advances and the people behind them. From transportation, food, space, internet, and health, creators reveal their inspirations and roadblocks they encountered in bringing their breakthroughs to the public. Hear all-new episodes of the award-winning Unsung Science podcast every other Friday.