Harry Potter and the Quest forSockRolidJun 22, 01:17 PMFrom Wikipedia on "touch screens" - 'The proposition is that human arm held in an unsupported horizontal position rapidly becomes fatigued and painful, the so-called "gorilla arm". It is often cited as a prima facie example of what not to do in ergonomics.' It doesn't really matter whether a touch-screen iMac runs Mac OS X or iOS. It