Video: Arithmetic Logic Unit (ALU): Definition, Design & Function. An arithmetic logic unit (ALU) represents the fundamental building block of the central processing unit of a computer. An ALU is a digital circuit used to perform arithmetic and logic operations.
Snake Crawls up a Wall. 02.10.2008 - Many people ask me about the climbing capability of snakes. In particular, people want to know if snakes can get up into their attic. The answer is that yes, some species of snake are excellent climbers, and can climb walls.
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.