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.
Most snakes that enter houses are of non-venomous varieties: rat snakes, brown snakes, etc. Entrance seems most often to be gained through open doors or holes leading from the foundation or crawlspace. Holes cut in washrooms and beneath sinks for pipes are often big enough to allow entry by snakes.