Robotic guards will soon patrol South Korean prison

To quote Princess Laia: "I have a bad feeling about this."
(Popular Science)

"Super-black" material absorbs 99 percent of light that hits it

"It works by collecting and trapping light inside tiny gaps between the nanotubes, which are arranged in vertical fibrous strands like a tall shag carpet. This light would otherwise reflect off the surface and bounce around, creating noise."