Sorry for the crazy sounding title, but google
youtube DARPA bigdog
and watch the amazing footage. Then realize that

1. This thing is about as smart as an insect.
2. Insects are about 1/1,000,000th as smart as humans.
3. Computing power tends to double about every year or two.
4. 2 to the power of 20 is a little over 1,000,000.

Think about it.

The 21st century is going to be very interesting, and maybe not in a good way.