computers
This Webpage Uses Centuries-Old Physics to Let Anyone Scroll Hands-Free

The Doppler effect, first proposed by Christian Doppler in 1842, is a well-documented phenomenon in physics which causes a change in the frequency of a wave as the source moves closer to the observer. It's the science behind satellites and speed cameras alike. And, in the hands of one computer science student, it can make a little magic happen on your computer. Read More >>