Key dates: Aug. 3, qualification and finals Venue: North Greenwich Arena Big story: Can anybody beat the Chinese? Seems unlikely this year. China is favored to win gold with defending champion Lu Chunlong back from Beijing. Bronze medalist Dong Dong, however, upset Lu at the last world championships. Top U.S. prospects: Steve Gluckstein (above), 22, of Atlantic Highlands, N.J., is the only U.S. qualifier among the 16 men. Lake Forest's Logan Dooley is the alternate should Gluckstein be injured. No U.S. man has ever medaled. Others to watch: Canadian Jason Burnett, who won a surprise silver medal in Beijing and who is a six-time Canadian champion, should earn the third medal on offer. Little-known fact: George Nissen, who designed the first modern-style trampoline for the U.S. military in 1936 to help train pilots and soldiers, at age 86, attended the 2000 Sydney Olympics when trampoline was brought into the Games for the first time.