Encore edition: The wars of the future will be fought in megacities around the world by soldiers connected - and possibly even augmented - by neural implants and AI. In this episode, we examine how military leaders are preparing for a radical shift in combat.

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Encore edition: Millions of people suffering from mental health issues are left untreated and undiagnosed. In this episode, we meet the psychologists and scientists studying how artificial intelligence can help.

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Artificial intelligence will change all of our jobs, according to IBM's Chief Executive. But will the technology augment workers or replace them? Ms. Rometty spoke with WSJ Editor in Chief Matt Murray at the World Economic Forum in Davos, Switzerland.

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Algorithms are the new matchmakers. Apps have turned dating into a game. And unlimited options have confounded digitally savvy singles. We spoke to the technologists and social scientists reshaping romantic connection.

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Shifting weather patterns and rising temperatures are altering what crops farmers can plant. In the last of a three-part series on climate, we examine how advancements in AI and genetics could help farms battle drought and crop disease.

As cattle farmers struggle with rising temperatures, scientists are scrambling to find solutions. In the second of a three-part series on climate, we meet a calf genetically engineered to withstand heat and get a taste of lab-grown beef.

Demand for wild seafood is rising-but so is the cost of bringing it ashore. In the first of a three-part series on climate, we meet the fishermen and scientists grappling with warming waters, shifting currents and rapidly changing economics.

Encore edition: Kenya and China have rapidly embraced mobile wallets. Why are Americans still reaching for cash and credit cards? We speak to the experts and explore a future where making a payment could be as easy as nodding your head.

The WSJ's David Pierce sits down with David Limp, Amazon's Senior Vice President of Devices and Services, to discuss Alexa's next moves. Plus, an inside look at how Amazon chose its newest headquarter locations.

Dara Khosrowshahi, chief executive of the ridesharing giant, talks with the WSJ's Gerard Baker about expanding Uber's reach, fixing its work culture and setting the course for an initial public offering.