Dr. Carl D. Marci is a physician, neuroscientist, author and entrepreneur with an incredible book for parents called 'Rewired: Protecting Your Brain in the Digital Age.' 
In this interview, Dr. Marci answers pressing questions from parents: 

How are screens affecting our childrens' brains? 
Should we be giving our children a learning tablet? 
When should our children be given a smartphone? 
Why are adolescents more depressed than ever before? 

The big takeaway from this conversation is how parents can best connect with their children and support their brain development. 
Here's a link to Dr. Marci's book 'Rewired: Protecting Your Brain in the Digital Age': https://rewiredthebook.com