2 Feb 2012 by Jim Fickett.
A robotics lab at University of Pennsylvania is working on swarms of hovering drones that cooperate:
From a technology viewpoint, that's pretty fun and impressive.
When you combine such technological advances with the current administration's claiming the right to assassinate American citizens without trial (even without providing any public justification) it gets a little scary. (The ACLU is suing, hopefully to at least force Obama to provide a public, legal basis for the assassination program.)