Actually recently read an article about it last week. https://www.scpr.org/blogs/education/2013/03/29/13098/want-to-teach-better-new-study-says-use-your-hands/

Actually recently read an article about it last week. https://www.scpr.org/blogs/education/2013/03/29/13098/want-to-teach-better-new-study-says-use-your-hands/ https://www.scpr.org/blogs/education/2013/03/29/13098/want-t... Maybe it was this one?