You are on your couch, laptop open, Wi-Fi bars at their strongest. Feels safe, right? Except that same signal is probably drifting right through your walls and your windows and out into the street. This isn’t paranoia; it’s basic physics.
And that’s precisely the problem a team of computer scientists set out to fix with something surprisingly low-tech: a bit of 3D-printed plastic wrapped in regular aluminum foil. According to Dartmouth College's official research announcement, researchers built a custom-shaped reflector to redirect a router's signal where it is needed and reduce it where it is not.
