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Michael Phelps is going home from the summer games with a record eight gold medals in a single Olympics. Perhaps the most exciting and controversial win of those eight races was the men's 100-meter butterfly.
Even Michael Phelps wasn't sure he had won the race until the results were posted on the scoreboard, but the pictures prove it. So we spent an afternoon at the Water Cube and asked people what they thought of the photos.
Most of those we asked didn't feel Phelps touched the wall first. They say watching it on television it appears Serbia's Milorad Cavic beat Phelps to the wall.
Phelps won by one-hundredth of a second.
But when people saw the picture from above water, Phelps was their choice. But some still had their doubts. Some even asked how it's possible to know for sure.
The international ruling body of swimming broke down the video replay frames to a 10,000th of a second to confirm that Phelps won.
But not everyone believes the sensors on the pools wall could be that accurate. One fan said they should award two gold medals.
Others are glad Phelps received the gold. "He's won so many other races, so congratulations, he deserves it," one fan said.
Another fan just welcomes the competition. "It was a good, close race, exciting, everything the Olympics is about," he said.
Of the eight gold medals Phelps is taking home, three were in relays, the other five in individual events. In seven of those races, Phelps or his team set world records.