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The United Nations says Russian strikes on Ukrainian ports pose a threat to the global food market. The U.S. is seeking to safeguard Ukrainian grain shipments.

The United Auto Workers has not made a presidential endorsement yet. The union is also engaging in contentious negotiations with automakers.

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.

Two churches were bombed in Egypt Sunday, killing more than 40 people. To learn about the Coptic Christian community that was targeted, Rachel Martin talks to Sudarsan Raghavan of The Washington Post.

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.

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.

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.

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

The favored candidate in Sunday's presidential election is from the PRI, which ruled Mexico for decades, until it was ousted from power in 2000. Enrique Pena Nieto promises a different approach to drug violence and says he can boost a struggling economy.