Engineering students have designed an autonomous robot that can find and open doors in 3D digital simulations. Now they’re building the hardware for an autonomous robot that not only can open its own doors but also can find the nearest electric wall outlet to recharge without human help.

One flaw in the notion that robots will take over the world is that the world is full of doors.

And doors are kryptonite to robots, said Ou Ma, an aerospace engineering professor at the University of Cincinnati.