how can touch screen distinguish my finger from other objects touching it?
In: 7
It can’t.
Imagine there’s a thin layer of very weak electricity on the screen, when you put your finger anywhere on it you will affect that electricity, since it can flow through your finger. Then by using fancy math it can calculate *where* on the screen your finger is.
Any object that can conduct electricity will work, there are both pens and gloves made specifically for touch screens for example.
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