An American archery thunderbolt

Maybe there’s something in the water in central Iowa, something that produces teen-age Olympic sport sensations.

Three years ago, it was Shawn Johnson. This was way before “Dancing with the Stars.” This was when Shawn was hanging out at Chow’s Gymnastics & Dance and going to Valley High in West Des Moines. Shawn went to Beijing in 2008, won four medals, one of them gold on the balance beam, came back home and — she was a star.