Jibreel, from Detroit, and Raymond, from Los Angeles, beat hundreds of hopefuls in a national search and now find themselves sharing a tiny dressing room in New York, juggling schoolwork and keeping up with last-minute changes to the show.

WSJ: 2 guys have a ball as Michael Jackson on Broadway

Those kinds of studies are more rare than straight correlative studies, but they exist and show strong evidence that learning a new motor skill (such as juggling, for example) leads to changes in the white matter of the motor cortex.

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