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.
Once under the house, they can almost always find a way up into the walls, via architecture gaps or where holes are cut to allow plumbing pipes through. And yes, rats can enter a house via plumbing and even sewer pipes, and come up through the toilet. Here are four small examples of easy-to-spot rat entry points.