(As the topic) I am curious as IIRC (but forgot where the article is on the Internet), if a touch surface is wanted to be able to detect more than 1 touch point at the same time, then that touch surface needs adding 1 more conductive(?) layer. (e.g. 2 points -> 2 layers, and so on) So I wonder how many these layers are on the iPhone / iPod touch / iPad or even the trackpad on every MacBook (Pro). (correct me if I'm wrong) Just curious, thanks in advance!