With 68% of 7.5 billion earthlings owning a mobile phone, these brilliant devices are more common than a toothbrush. But how much screen time is too much? Full text: https://mkwr.co/2Qt34mK Source: “Number Of Smartphone Users Worldwide From 2014 To 2020 (in billions)” by Statista:  “Number Of Mobile Subscribers Worldwide Hits 5 Billion” by GSM Association:  “Mobile Time Spent 2018” by eMarketer:  “5 Billion Subscriber Infographic” PDF by GSMA Intelligence: Find me on Twitter