KNTV NBC Nightly News August 13, 2012 01:26:00
>> stick it! stick it! >> yeah! >> and it is the end of an era. the most dominant in olympic history and it's pure gold! >> the final tally is absolutely mind boggling. 18 gold medals. >> i could feel the tears start coming, and i tried to fight it but then i just decided just to let it go, and it's been a great career. it's been a great journey. >> a gold medalist. >> the future of usa swimming. >> michael gave me a high five and wished me good luck and that meant a lot to me. >> here's the starting. away well. usain bolt explodes and he's still the king of the 100! >> get the gold medal! >> ...