Anne Fernald (Stanford) has done some really impressive research on talking to children and how that affects how well they do in school. (<a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=IpHwJyjm7rM" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=IpHwJyjm7rM</a>)