tarwater decided it to retire from the sport after barely missing the team in three different events.ision by michael phelps to drop one of the races in the summer game, tarwater gets to go to london after all. >> i couldn't believe it was happening, because i started to hear the murmurings of phelps made an aannouncement. we don't know how it will affect you. we'll wait and see. then it was, you know, this could really mean something to me, you know. i was just shocked when i heard. >> that's exciting. phelps' scratch moved tarter to the top six, meaning he qualified for the 4x200 meter relay. good for him. we're your home for the olympics in london. >> stay with us for live coverage during the games, and you can check out the website for in depth articles and also videos right now on nbcbayarea.com. look at our special report on how the recent olympic gymnastics trials have raked in a lot of cash for south bay businesses. >>> 4:55. google researchers built a massive computer system that can actually teach itself. >> its first lesson, how about this? how to recognize cats. the "l.a.