Safehome.org on MSN

How Does a Motion Detector Work?

First developed for World War II, motion detectors have come a long way from the radar that pilots used way back then.
Artists are hardworking—they gladly embrace long, tedious multi-step processes in search of magic! This is probably why in the early 1900s, Émile Cohl hand-drew 700 drawings to bring life to his paper ...