Schwazer, 27, had been due to compete Saturday in the men's 50-kilometer race walk.

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Italy's Olympic 50km race walk champion Alex Schwazer is also out of the Games after failing a drugs test.

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Mr. Schwazer won a gold medal at the 2008 Beijing Olympics, setting an Olympic record in the 50-kilometer race walk.

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As the London Olympics approached, Mr. Schwazer said he began to doubt whether he could withstand the physical demands of competing in two long-distance events the 20-kilometer and the 50-kilometer race walk.

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Four of the events, the marathon, the walk, cycling road race and the cycling time trial, are free.

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Posner hopes participants will walk away from the race with the satisfaction of completing a new challenge, one with historic roots.

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Dilworth, Troody's creator, hopes the pigeon-sized robot will be mother to a whole race of dinosaur-like robots that will walk around museums, entertaining and educating children.

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And one of the great things about watching our Olympics is we are a portrait of what this country is all about -- people from every walk of life, every background, every race, every faith.

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My son Joshua and I were out for a morning walk along the beach in front of my home when suddenly the sea began to race in.

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This time, we want to talk about the shuttered mills that once provided a decent life for men and women of every race, and the homes for sale that once belonged to Americans from every religion, every region, every walk of life.

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