We explore the hidden role of cobalt in the A.I. revolution. The element is a key ingredient of lithium-ion batteries, which power everything from cell phones to laptops to electric vehicles. But the way cobalt is mined is troubling. New Yorker journalist Nicolas Niarchos takes us to the Democratic Republic of Congo, which accounts for more than 70% of the world's cobalt supply. There, he exposes child labor in the supply chain and reveals a new frontier of competition with China.

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In this special bonus episode, Oz and Karah share their trip to the Consumer Electronics Show. They present excerpts from a conversation with Matt Monahan of The Washington Post about how to best harness the power of AI, while avoiding common pitfalls. Matt is head of product for Arc Publishing, which began life as The Post's internal publishing suite, and is now licensed by hundreds of partner sites. Oz and Karah also discuss their highlights from the CES floor, including a device to track dogs' emotions.

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In this special episode, Oz and Karah examine our evolving relationship with the technology we create. Karah meets Jason Cohen, CEO of Analytical Flavor Systems, to see if his team can hack her taste preferences, and use AI to create a new flavor of beverage that she will love. Oz and Karah also look ahead to Season 2, previewing stories they are excited to report, including algorithms that promise to optimize end-of-life conversations. And they share highlights from conversations with guests from Season 1 who shaped their thinking about AI: Yuval Noah Harari, Siddhartha Mukherjee, and Regina Barzilay of MIT.

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