Tree Climbing Robot
galactic grub writes "New Scientist's new Tech Blog has an article about a remarkable, if slightly creepy, tree-climbing robot being developed by robotics experts from Carnegie Mellon and several other US Universities. The article comes complete with a video clip of it going up several different surfaces."
if you push in each direction into a small grove, such as the space between bricks, or the ridges in bark, you are able to have enough friction to keep you up, I rock climb quite often and simply by pushing with both hand and feet against rocks, you can even climb the roof of a cave.