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 every case I've ever seen involving snakes in an attic, there were also rodents in the attic - usually rats. Rats leave a very distinct odor, and snakes simply follow the rat trails up into the attic, in order to catch prey. As long as there's food, the snakes live up there. Snakes can fit into tiny spots, so they can follow any area a rat can go. Of course, one of the best ways to solve a problem with snakes in the attic is to solve the rodent problem first.