Chris Varenhorst, the MIT engineering student responsible for this hydraulic-powered door that can be opened with the tap of an iPhone app or the rap of a secret knock sequence, says that after a long day of studying, he doesn't want to waste time messing with keys. We have a different theory.
Our third updated DIY project from the Popular Science digital archives involves luring and then trapping bugs that have managed to find their way inside your house--a truly universal problem. Follow along as we update a circa-1971 trap for today's smarter, more intelligent insects for less than $20.
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.