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NPR's Scott Simon speaks with Alberto Minetti of the University of Milan about his research on how astronauts on the moon could keep fit by running around the inside of a cylindrical "Wall of Death."

In Kenya, a former Ugandan Olympic marathon runner Rebecca Cheptegei has died days after being set on fire by her former partner.

Could it be the biggest upset in tennis history? Roberta Vinci beat Serena Williams in the semifinals of the U.S. Open. Vinci and fellow Italian will face off in the final on Saturday.

Either China or Kazakhstan will be chosen on Friday as host of the 2022 Winter Olympics. European nations have been scared off by the cost of hosting the event, but China has the ambition and the money to match.

As nuclear talks with Iran approach a deadline, the U.S. must ease sanctions enough in order to make a deal with Iran while not letting it off the hook completely.

NPR's Leila Fadel talks to Sergey Radchenko of the Johns Hopkins School of Advanced International Studies about Russia's claim to have captured the eastern Ukrainian town of Soledar.

Fire departments have tried to diversify their ranks for years with only modest success. The profession remains overwhelmingly white and male. One California training program is trying to change that.

Many questions still remain about a data leak of classified documents related to the war in Ukraine and intelligence from other nations.

Kevin Spacey's arraignment for allegedly sexually assaulting an 18-year-old is scheduled for Jan. 7. David Greene talks to Vox Film Critic Alissa Wilkinson.

Was the change in Egypt's government a coup or not? For members of Congress, the difference is more than a question of semantics. U.S. law requires that aid be cut off to a country that undergoes a military coup — which, if it were to happen in the case of Egypt, would bring on dramatic consequences.