National Geographic, April 2017, page 63 reflecting on the role of the non-biological  on our biological lives: Adults in 2015 spent approximately ten hours a day with their eyes focused on a screen. If our day splits roughly, with eight hours each, between sleep, work and other, where does that leave family, love, helping to make the world a better place, appreciating nature, or sitting down with a friend or co-worker and having a conversation?