Monkeys with sensors implanted in their brains have learned to control a robot arm with their thoughts, using it to feed themselves with fruit and marshmallows. University of Pittsburgh School of Medicine scientists behind the experiment say it will lead to the creation of brain-controlled prosthetic limbs for amputees or patients with degenerative disorders.Sure, you start them with fruit and marshmallows now. But where will this lead? I think the monkeys will be a tad bitter that they're being made to do stupid things by mad scientists, and they'll use their robot arms for nothing but Sweet Revenge. There, I've said my bit. Don't come complaining if there's a metallic tapping on your door one night. It might be one of the last things you ever hear before you're dragged down the street screaming; that is, other than the monkey squeals of delight as our new overlords begin their ascension.