AMYLOU got the right answer!!!

Although some of these still exist in older homes, this has not been part of the home design for more than 40 years. What is it?

A. The milk chute/milk door. They are in all of the homes in my area and are now used for mail and newspaper and flyer delivery.

Today's question is

Many studies have shown that kids who have this in common were best set up for success in adulthood. What is it/