Beware the robot swarm (actually, it's ok)

The University of Colorado has developed robots one inventor compared to living cells. The size of ping-pong balls, the 20 robots built so far form a mini-swarm, and cooperative mass like "a liquid that thinks." Future versions have a variety of uses in space, including assembling structures and reconnoitering planets for humans.  As the team points out, what are human beings but masses of cooperating cells - kind of like tiny robots?