either-direction
31Valve — This article is about the flow control device. For the game developer, see Valve Corporation. For the electronic component, see Vacuum tube. For other uses, see Valve (disambiguation). These water valves are operated by handles. A valve is a… …
32Operation Michael — Part of the Western Front of World War I …
33Rotation matrix — In linear algebra, a rotation matrix is a matrix that is used to perform a rotation in Euclidean space. For example the matrix rotates points in the xy Cartesian plane counterclockwise through an angle θ about the origin of the Cartesian… …
34Magnetotactic bacteria — (or MTB) are a polyphyletic group of bacteria discovered by Richard P. Blakemore in 1975, that orient along the magnetic field lines of Earth s magnetic field. To perform this task, these bacteria have organelles called magnetosomes that contain… …
35Australian handball — Original research|date=February 2008Unreferenced|date=April 2007Australian Handball is a popular schoolyard game in Australia and New Zealand. It is a variation of Chinese Handball, with many similarities to other Chinese Handball games, but more …
36liquid — liquidly, adv. liquidness, n. /lik wid/, adj. 1. composed of molecules that move freely among themselves but do not tend to separate like those of gases; neither gaseous nor solid. 2. of, pertaining to, or consisting of liquids: a liquid diet. 3 …
37Ceiling fan — A ceiling fan is a fan, usually electrically powered, suspended from the ceiling of a room, that uses hub mounted rotating paddles to circulate air. Casablanca Fan Co. ceiling fan from the early 1980s. A ceiling fan rotates much mo …
38Rattleback — A rattleback, also known as an anagyre , celt , Celtic stone , rebellious celt , rattlerock , spin bar , wobble stone or wobblestone and by the product names ARK, Bizzaro Swirls, RATTLEBACKS, Space Pet and Space Toy, is a semi ellipsoidal top… …
39atmosphere — atmosphereless, adj. /at meuhs fear /, n., v., atmosphered, atmosphering. n. 1. the gaseous envelope surrounding the earth; the air. 2. this medium at a given place. 3. Astron. the gaseous envelope surrounding a heavenly body. 4. Chem. any… …
40electric motor — motor (def. 4). [1885 90] * * * Introduction any of a class of devices that convert electrical energy to mechanical energy, usually by employing electromagnetic phenomena. Most electric motors develop their mechanical torque by the… …
