Human operators outside the danger zone guide them, watching video from tiny cameras to look for victims. (discovermagazine.com)
Are walls to protect ourselves from outside dangers or are they there also to stop our own aggression? (bpigs.com)
By Sandy Robins Statistics show that cats that enjoy an indoors - only lifestyle live longer because they're aren't exposed to such outside dangers as traffic, animal abusers, predators and disease. (hartz.com)