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

CNN: SHARE THIS

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

WSJ: Menu

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.

WSJ: Menu

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.

FORBES: Dinosaur Robots For Sale

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.

WHITEHOUSE: Our Top Stories