While 3D video may not be very popular these days, someone's still wearing 3D glasses -- or rather, something. Newcastle University scientists are outfitting praying mantises with very small 3D eyewear to test their depth perception, which is unique in the insect world; most species are limited to 2D. The researchers want to see if the bugs are fooled by the effects of a 3D movie like that you'd see in a theater. If they are, we'll know that they evolved 3D vision similar to that of humans and monkeys.