How does a touch screen work?

Cell phones and tablets are like portals into other worlds. You can play games, take photos, read books – all with just the tap of a finger! But how do touch screens work? We asked mechanical engineer and science educator Tiffani Teachey to help us find the answer. Got a question that you’ve been monitoring? Send it to us at BrainsOn.org/contact, and we’ll tap out an answer! See omnystudio.com/listener for privacy information.