direction switch
41Elevator — For other uses, see Elevator (disambiguation). A set of lifts in the lower level of a London Underground station. The arrows indicate each elevator s position and direction of travel …
42List of snowboard tricks — Snowboard tricks are aerials or maneuvers performed on snowboards for fun, or in competitions. Most often, these maneuvers are performed on obstacles such as jumps, halfpipes, quarterpipes, hips, handrails, funboxes, or ledges, or on the surface… …
43Right- and left-hand traffic —   countries with right hand traffic …
44Life Sciences — ▪ 2009 Introduction Zoology In 2008 several zoological studies provided new insights into how species life history traits (such as the timing of reproduction or the length of life of adult individuals) are derived in part as responses to… …
45Ceiling 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 …
46Glossary of rail terminology — Rail transport Operations Track Maintenance High speed Gauge Stations …
47turn — turn1 [ tɜrn ] verb *** ▸ 1 change position ▸ 2 change direction ▸ 3 make circular movement ▸ 4 do/become something else ▸ 5 become particular age ▸ 6 move page to other side ▸ 7 about stomach ▸ 8 milk: become sour ▸ 9 affect game/fight ▸ 10… …
48Brevity code — Contents 1 American/NATO codes 1.1 A 1.2 B 1.3 C …
49Memristor — Type Passive Working principle Memristance Invented Leon Chua (1971) First production HP Labs (2008) Electronic symbol …
50Flip tricks — A flip trick is a type of skateboarding trick in which the skateboard flips in a particular way. In many tricks, the skateboard flips upside down and/or end over end. The most common and well known flip trick is the kickflip, invented by Rodney… …
