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I have been wondering this for a while now... My laptops touch-pad is very nice, you can be incredably gentle with it unlike some others I have tried out. But why do they only work with skin contact?

Are they heat sensitive as well as pressure? I tried warming some things up to test them but to no effect. Or for instance a thin piece of material over the finger and it still works, but is less sensitive, but anything other than a finger under the material and nothing happens.