Pity the poor security guard. In busy environments such as prisons and crowded shopping malls, they need to be everywhere at once. And in a more isolated setting—on the night shift in a lonely warehouse, for instance—they may struggle to stay engaged and alert. Security robots don’t have these problems. Instead, they have artificial intelligence that works without getting tired or bored and streaming video to broadcast everything they see, bringing others on the scene no matter where they might be.