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.
Spiders cannot climb: 1  Blocks which do not impede the player, such as grass, sugar cane, fire or flowers. 2  Water or lava, but will behave as other mobs (swim/drown, burn). 3  Nether portal blocks (they can climb the surrounding obsidian though).