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Originally Posted by Noughty
Actually, you might not need to move your thumb. It depends on what kind of touch screen it is. I only know two kinds (don't know how the technology differs), one reacts to touch (iphone) so you'll need to move your finger. Another is like nokia - you need to slightly press, so you don't need to move thumb, you can hold it on the screen and slightly press when needed.
I have no idea which touchscreen this kindle have and would like to know. The later option sounds better for an ereader.
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The Kindle has an "infrared beam" touch screen. There are infrared emitters positioned all around the edges of the screen bezel, so a "grid" of invisible beams is over the screen. Breaking one of these with your finger (or anything else) will register a "touch". The beams are actually positioned slightly (perhaps 1mm) above the screen, so you don't need to physically touch the screen at all.
The iPhone uses a capacitive touchscreen. From Wikipedia:
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A capacitive touchscreen panel consists of an insulator such as glass, coated with a transparent conductor such as indium tin oxide (ITO).[11][12] As the human body is also an electrical conductor, touching the surface of the screen results in a distortion of the screen's electrostatic field, measurable as a change in capacitance.
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