Update: If you were amazed by this, don't miss the hilarious
spoof. It's even better. Boston Dynamics keeps working on their
BigDog quadruped robot, which will probably grow to be the
future AT-AT of the Pentagon. Its evolution since the last time
we saw it is nothing sort of mindblowing, and a bit spooky.  It
looks like an actual biological quadruped. Seeing it climb
through rubble, snow, jumping over obstacles like a wild goat,
and saving a near-fall on iced ground at the last second (fast
forward to the middle of the video) defies belief. It feels so
"animal" that I almost feel bad when they hit it to demonstrate
how it regains balance on its own.