SEATTLE -- Twins Cierra and Makenna Graham aren't any different than your average 12-year-olds.
Except for one thing.
The Poulsbo, Wash., sixth-graders can scurry up an indoor rock-climbing wall faster than preteens sell out Justin Bieber concerts.
The girls began rock-climbing about two years ago -- quite by accident.
Parents Andrew and Robyn Graham and the girls were in Christchurch, New Zealand, readying for the long flight back to Seattle.
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