Do you run, cycle or swim to lose weight? Herman Pontzer, an evolutionary anthropologist who specialises in understanding how humans use energy, thinks you’re probably wasting your time. His idea of the “exercise paradox” suggests that the amount of energy people use in a day is constrained (by evolution) and that exercising more doesn’t end up burning more calories. Figuring out why our bodies work like this is part of Prof Pontzer’s bigger project to map out and better understand how evolution has shaped variations in human biology.

Hosts: Alok Jha, The Economist’s science and technology editor. Contributor: Herman Pontzer, professor of evolutionary anthropology and global health at Duke University and the author of “Burn” and “Adaptable”.

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Good bosses are rare. They don’t have to be. The skills of management can be learned.

The Economist’s management columnist, Andrew Palmer, is here to help. The second season of Boss Class features leaders at some of the world’s best performing companies, from Levi’s to Novo Nordisk to Google.

New episodes are out weekly starting May 12th.

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A sophisticated, predatory, multi-billion dollar industry is emerging from the shadows. It already rivals the size of the illicit drug trade. And it’s about to get bigger and much more powerful.

The Economist’s Sue-Lin Wong follows a trail that starts with the collapse of a bank in rural Kansas to uncover a global, underground scam economy built around human trafficking, corruption and money laundering. Can it be stopped?

Available now.

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