Datapoint later decided not to use the chip, and Intel marketed it as the 8008 in April, 1972. This was the world's first 8-bit microprocessor. It was the basis for the famous Mark-8 computer kit advertised in the magazine Radio-Electronics in 1974. Source(s): http://en.wikipedia.org/wiki/Microproces...
In the photo in the middle, we see a mother opossum with babies down a wall. She actually can climb up and out. They are really good climbers. When I go into an attic to look for opossums, I usually look down all the available walls, and that's where I find them. That was the case in the right photo.
The drawback, however, is that a skeleton might shoot over the wall, a creeper could explode if a player is standing near the wall and a spider could still climb over the wall. Unlike fences, if two cobblestone walls are placed one block apart diagonally, you cannot walk between them.