Movement in Class

https://www.nytimes.com/2017/03/21/well/family/why-kids-shouldnt-sit-still-in-class.html?action=click&pgtype=Homepage&version=Moth-Visible&moduleDetail=inside-nyt-region-3&module=inside-nyt-region&region=inside-nyt-region&WT.nav=inside-nyt-region