Harvard had studies that the iPad can affect the head, neck and shoulders of spending time on the tablet. People who use iPads hold the device almost at their lap, and are putting a lot of strain on the neck muscles. Harvard says ,"If you think about your position when you are hunched over looking down, your head is hanging out over space, so you are using your neck muscles to support the weight," The best position to have your tablet is in a movie position so you don't have to look down or strain your neck.
http://latimesblogs.latimes.com/technology/2012/01/harvard-researchers-ergonomics-ipad.html
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