In the name of progress, DARPA and your good friends at Boston Dynamics, have improved the BigDog rough-terrain robot so that it can now fling cinder blocks. It’s for your protection. From the promotional copy: “BigDog handles heavy objects. The goal is to use the strength of the legs and torso to help power motions of the arm. This sort of dynamic, whole-body approach is routinely used by human athletes and animals, and will enhance the performance of advanced robots.”