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Michael Phelps (L) and Missy Franklin (R) pose with watches given to them as the best performers at the U.S. Olympic swimming trials, in Omaha, Nebraska, July 2, 2012. REUTERS/Jeff Haynes (UNITED STATES - Tags: SPORT SWIMMING OLYMPICS)

Kerri Walsh and Misty May (R) from the United States celebrate their win in the women's gold medal match on August 24, 2004 during the Athens 2004 Summer Olympic Games at the Olympic Beach Volleyball Centre at the Faliro Coastal Zone Complex in Athens, Greece.

United States' Allison Schmitt reacts to her gold medal win in the women's 200-meter freestyle swimming final at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London, Tuesday, July 31, 2012.

(L-R) Missy Franklin, Jessica Hardy, Lia Neal and Allison Schmitt of the United States celebrate with their bronze medal during the the Medal Cermony for the Women's 4x100m Freestyle Relay on Day One of the London 2012 Olympic Games at the Aquatics Centre on July 28, 2012 in London, England.

This is an older photo, but it surfaced Sunday on Twitter and was passed around the Web after Pistorius raced. It reminds viewers that what Pistorius did for other amputees is immeasurable. Around the world, there were people who are missing arms and legs who looked at him and thought, "If he can do it ..." Ellie Challs, the young girl he is racing here, saw a man who looked like her, but didn't accept limits.

Missy Franklin/NBC

Gold medallist Michael Phelps of the United States exits the pool after the United States won the Men's 4x100m medley Relay Final on Day 8 of the London 2012 Olympic Games at the Aquatics Centre on August 4, 2012 in London, England.

McKayla Maroney of the United States stands on the podium with her silver medal during the medal ceremony following the Artistic Gymnastics Women's Vault final on Day 9 of the London 2012 Olympic Games at North Greenwich Arena on August 5, 2012 in London, England

London 2012: Who were the real winners, losers? (Photo: Al Bello / Getty Images) #NBCOlympics

Beach Volleyball: Day 8 - Beach Volleyball Slideshows | USA player Kerri Walsh, left, hugs teammate Misty May-Treanor after defeating the Netherlands 2-0 during the women's round of 16 (Photo: Andrew Weber-US PRESSWIRE / US Presswire) #NBCOlympics

Oscar Pistorius In London - Track & Field Slideshows | South Africa's Oscar Pistorius starts in a men's 400-meter heat during the athletics in the Olympic Stadium at the 2012 Summer Olympics. (Photo: Anja Niedringhaus / Associated Press) #NBCOlympics

Swimming: Day 7 Finals - Swimming Slideshows | U.S. swimmers Franklin and Beisel place first and third in the women’s 200m backstroke final. (Photo: Paul Drinkwater / #NBCOlympics

Slideshow: Michael Phelps through the years | Final Olympic golden moment: Michael Phelps, center, of the U.S. celebrates with teammates from left, Brendan Hansen, Matthew Grevers and Nathan Adrian after receiving their gold medals for winning the men’s 4x100 medley relay final during the London 2012 Olympic Games, Aug. 4, 2012. (Photo: Jorge Silva / Reuters) #NBCOlympics

Oscar Pistorius In London - Track & Field Slideshows | South Africa's Oscar Pistorius, left, and Jamaica's Rusheen McDonald compete in a men's 400-meter heat. (Photo: David J. Phillip / Associated Press) #NBCOlympics

Vintage style London Olympics poster by Andrew Maunders.

Ryan Lochte lost to Michael Phelps in the 200 free final at the US Olympic swim trials Wednesday, after beating Phelps Monday in the 400 individual medley. (via USA Today)

2012 Olympic medals www.nbcolympics.c... (Photo: LOCOG / Getty Images) #NBCOlympics

The London 2012 Olympic Stadium is seen from the top of the ArcelorMittal Orbit in the London. www.nbcolympics.c... (Photo: KI PRICE / Reuters) #NBCOlympics

The Olympic flame burns in a cauldron atop the Athens Acropolis on May 16, 2012 in Athens, Greece. The Olympic flame with be handed over to London during a handing over ceremony that will be held in Athens on May 17. www.nbcolympics.c... (Photo: Yannis Behrakis-Pool / Getty Images) #NBCOlympics

Giant sets of Olympic Rings are going to be displayed at iconic sites across the United Kingdom. The largest set of Rings to be installed are seen in this photo on the Tyne Bridge in Newcastle and Gateshead. #NBCOlympics