You know how you can never get one certain song out of your head? Well, for Michael Phelps, that song is the National Anthem. Phelps secured his 21st gold medal on Tuesday. If he were a country, he would be 39th on the all-time Olympics gold medal leaderboard. He also tied a 2,168-year-old Olympic record.

+ NYT: How the U.S. Crushed the Competition in the Women’s Gymnastics Team Final.

+ “The Olympics allows the best athletes in the world to thrill us with their mind-blowing dedication and excellence. And it affords the rest of us the opportunity to do what we do best: Sit on the couch and use social media to judge people who are actually doing something.” That’s just one of my 16 Thoughts on the 2016 Couch Olympics.

+ How BMW’s self-driving technology helps US swimmers.

+ Should we be worried about the North Korean gymnast who took a selfie with a South Korean gymnast?

+ OK, so the Olympic Diving Pool turned green. Compared to the dire predictions for the Rio games, this doesn’t seem like much of a big deal.

+ That time a 9 year-old Katie Ledecky got an autograph from Michael Phelps.