Typing on a touch-screen for long periods of time may be more likely to cause muscle issues in the upper body than using a conventional keyboard, researchers have found. Unlike the traditional keys found on desktop PCs and notebooks, touch-screens (virtual keyboards) are activated by any physical contact with the skin.
Read more: http://www.dailymail.co.uk/health/article-2848190/Study-finds-type-tablet-computers-face-muscle-problems-shoulder-strain.html#ixzz3K5rjcUSL
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