She's still in high school, but boxer Claressa Shields is also an Olympic gold medalist, as she won her middleweight bout Thursday. She defeated Russia's Nadezda Torlopova by a score of 19-12, overcoming the Russian with both speed and power.

It may not be an Olympic sport, but Wisconsin teen Austin Wierschke was just named the fastest texter in America. The texting champion was awarded $50,000. Wierschke speaks with host Michel Martin about how he keeps his thumbs in shape.

Why do the best weightlifters have short arms? What's the biggest physical challenge that marathon runners face? What kind of advantages do athletes from West Africa — and from Asia — enjoy? The Olympics bring a fresh chance to look at those questions, and see how athletes' bodies are changing.

It's Day 13 of the London Games, and the overall medal tally stands at 82 for the United States, 77 for China, and 48 for Great Britain. Here's a roundup of the news that caught our eye this morning

Oscar Pistorius, who made history last weekend when he became the first amputee to run in an Olympic race, saw his London 2012 experience come to an abrupt end Thursday — before an appeal put his South African 4x400m relay team back in business.