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.
Geckos. Geckos are small lizards famous for their ability to walk up walls and other sheer vertical surfaces, and to hang from ceilings. However, they come a cropper if they attempt to climb on non-stick surfaces! They're welcome creatures to have around in the house as they feast on the insects you don't generally want inside.