http://www.dailymail.co.uk/health/article-2997339/The-rise-iPad-neck-Tablets-three-times-strain-muscles-desktop-computers.html

This article highlights the negative physical effects of prolonged use of tablets, computers and phones. What they are not mentioning is that there is an intelligent and sustainable solution: 

You can learn specific cognitive processes related to the use of the body which will help you to avoid any further deterioration of your spine and posture. This is the specialty of the Alexander Technique.

+++Funny comment to article above: "One day humans will evolve to have a doughnut shaped spine, no neck, and thumbs the size of feet. Mouths will become unnecessary, as will ears. As a species we'll be taken over by chihuahuas, but we won't notice this..."