If you want a robot to maneuver aggressively, it has to be small. As you scale things down, the 'moment of inertia' - the resistance to angular motion - drops dramatically.

Drinking a cup of coffee with your eyes closed isn't a sophisticated task for a person, but it's hard for a robot.

If I say 'Find me an interesting painting' to Google, someday a robot could go around the Picasso museum and take a picture for me.

Robots are good at things that are structured.

Clearly, humans will always have a role to play in emergency response for law enforcement. But if there's an emergency, if there's a 911 call, the question is, do you want a human dashing off to respond to it right away?

Normally, in the presence of radiation, communication links fail. But with autonomous robots, you don't need communications.