AdvertisementMeet the teen changing how neuroscientists think about brain plasticity12:21Download AudioResumeMay 29, 2023Jon HamiltonRegina G. BarberBrit HansonRebecca RamirezfacebookEmailMora Leeb places some pieces into a puzzle during a local puzzle tournament. The 15-year-old has grown up without the left side of her brain after it was removed when she was an infant. (Seth Leeb)