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Thursday's theme was American stars battling each other. Biles topped Aly Raisman as they went 1-2 in the women's all-around. Michael Phelps easily defeated Ryan Lochte in their showdown in the pool.

The two new polio cases in Nigeria are the first detected on the African continent in more than two years.

There's more information on genetic mutations and in the scientific literature than cancer doctors can process easily. Smart, fast computers might be able to help.

Alex Rodriguez is retiring from the Yankees after 13 years with the team. At his last game on Friday, A-Rod will hardly get the same farewell as former Yankee and all-around good guy Derek Jeter. Rodriguez was a prodigy and a power hitter, but left fans disgusted by the way he handled a much publicized steroids scandal.

Marta Karolyi and her husband, Bela, have helped develop the top women gymnasts in the world since the '70s, first in Romania and now the U.S. At 73, she's now ready to join her husband in retirement.

The number of trains carrying oil along the Columbia River between Oregon and Washington could dramatically increase. There's a plan to ship more oil from the Bakken region of North Dakota to a proposed oil terminal in southwest Washington state. An oil train derailment earlier this year has shown the potential danger faced by the region.

NPR's Audie Cornish speaks with our regular political commentators, E.J. Dionne of the Washington Post and Brookings Institution and David Brooks of The New York Times. They discuss Hillary Clinton's release of her tax returns and the candidates' economic speeches.

In his last individual event at the Rio Summer Olympics, Michael Phelps came up short. His teammate Katie Ledecky broke her own world record — and then Anthony Ervin, 35, won gold in the freestyle.

At age 19, she's both the youngest member of the U.S. swim team and its most sure-thing winner. In her final Rio race Friday night, she shattered her world record for 800-meter freestyle.

"A-Rod" played third base one last time on Yankees turf on Friday. After a controversial career, including admitted steroid use, a sellout crowd bid the 41-year-old designated hitter a warm farewell.