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One athlete's "psych-up" ritual may psych out an opponent. And even treatments that lack hard evidence of benefit, scientists say, might provide a competitive edge if the athletes believe they work.
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There are 205 countries competing in Rio, many for decades, and most of them can't match Phelps' total of 23 golds.
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Puerto Rico has been sending athletes to the Olympics since 1948, a stretch in which it amassed eight Olympic medals, none of them gold. Tennis star Monica Puig changed that on Saturday.
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The U.S. swimming team competing in Rio is the most diverse yet. But there is still a long way to go before the ranks of swimmers reflect the diversity of the country.
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Carter outthrew favorite Valerie Adams of New Zealand, joining her father as a decorated U.S. Olympian. Men's basketball clinched a narrow win against Serbia in a second game of sloppy defense.
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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.
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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.
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When the 20-year-old won gold Thursday night, she wasn't just an athlete excelling at her sport. She was a symbol for what should have been self-evident all along: Swimming is for everyone.
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It came down to penalty kicks — and two of the U.S. women's soccer team players missed theirs against Sweden Friday, ending their run in Rio's Summer Games.
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The Friday night spectacle could be "a drug for depression in Brazil," says the creative director of the show that viewers around the world will see tonight.