Neuroscience isn't on many elementary school lesson plans. But this spring, a second grade class at Fairmont Neighborhood School in the South Bronx is plunging in. Sarah Wechsler, an instructional coach with wide eyes and a marathoner's energy, asks the students to think about the development and progress that they've made already in their lives. "You probably don't remember, but there was a time when you didn't know how to speak and you were just like 'Wah wah wah blah blah blah, mama,...