The research you're thinking of was by Roger Hart. There is a section about it midway thru this article about free-range parenting: https://www.google.com/amp/

The research you're thinking of was by Roger Hart. There is a section about it midway thru this article about free-range parenting: https://www.google.com/amp/s/www.theatlantic.com/amp/article/358631/ https://www.google.com/amp/s/www.theatlantic.com/amp/article...