How do touchscreens work?

How does a touchscreen work? Why can you text with your finger, but not with a q-tip? The physics of smartphones is a complicated and amazing mixture of engineering, physics, electronics and computer science. Topics:
Capacitive touch screen
Binary language

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Creator: Dianna Cowern
Research/Writer: Sophia Chen
Editor: Jabril Ashe & Dianna Cowern
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Thanks to Dan Walsh and Marcel Stieber

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