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NPR's Mary Louise Kelly speaks with Tim Podlogar, who researches exercise metabolism, about how elite cyclists consume thousands of calories each day to compete in the Tour de France.

The creators behind the viral TikTok account @lifeonfilm.27 give film cameras to strangers all over the world. In September, they handed one to one of the most powerful men in the world.

The 38-year-old tennis legend, who has been dealing with injuries in recent years, said he will step away from the sport after next month’s Davis Cup finals.

China's President Hu Jintao has sworn in a new leader for Hong Kong amid large public protests. The island is marking the 15th anniversary of its return to Chinese sovereignty at a time when mistrust toward China is at its highest level since Hong Kong's handover in 1997.

A surge in people "dating" chatbots, less oversharing on social media and Gen Alpha creating slang. Here's what experts predict the internet might bring us in 2024.

Bundle up and prepare: People living "basically anywhere from the Rockies eastward" will see extremely cold temperatures over the next several days, a meteorologist says.

President Trump is attending the World Economic Forum in Davos, Switzerland this week. He boasted about the strength of the U.S. economy, but said little about the event's main focus: climate change.

The special NPR series Body Electric examines how technology is affecting our posture. You can follow along with the series at npr.org/bodyelectric or on the TED Radio Hour podcast feed.

Scientists who warned of heat waves and rising seas this week also say that it's possible to avoid the worst effects of the warming climate. They're relying on computer models of the world economy.

Federal agencies are sending out sample contract agreements to their employees in what appears to be an effort to alleviate doubts. But some of the language differs from the original offer.