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.
Tommy Caldwell, 36, and Kevin Jorgeson, 30, could become the first to free climb the Dawn Wall. They are propelling themselves up this 3,000-foot section of Yosemite's El Capitan using only fingers and toes wedged into the granite's tiniest cracks and indentations. They use ropes only to catch themselves when they fall â which they do often â and not to aid in their ascent.