directional disturbance
31Space weather — is the concept of changing environmental conditions in outer space. It is distinct from the concept of weather within a planetary atmosphere, and deals with phenomena involving ambient plasma, magnetic fields, radiation and other matter in space… …
32Timeline of Chinese history — History of China ANCIENT …
33Fourth generation jet fighter — Lockheed Martin F 16. Dassault Mirage …
34Daniel Brandenstein — Daniel Charles Brandenstein NASA Astronaut Nationality American Status Retired …
35Tunnel boring machine — A tunnel boring machine that was used at Yucca Mountain nuclear waste repository A tunnel boring machine (TBM) also known as a mole , is a machine used to excavate tunnels with a circular cross section through a variety of soil and rock strata.… …
36Septic drain field — Septic drain fields, also called leach fields or leach drains are used to remove contaminants and impurities from the liquid that emerges from the septic tank. A septic tank, the septic drain field, and the associated piping compose a complete… …
37Roads in the United Kingdom — The A2 at Leyton Cross, Dartford. Roads in the United Kingdom form a network of varied quality and capacity. Road distances are shown in miles or yards and UK speed limits are in miles per hour (mph) or use of the national speed limit (NSL)… …
38Patterned vegetation — is a vegetation community that exhibits distinctive and repetitive patterns. Examples of patterned vegetation include fir waves, tiger bush, and string bog. The patterns typically arise from an interplay of phenomena that differentially encourage …
39History of electromagnetism — The history of electromagnetism, that is the human understanding and recorded use of electromagnetic forces, dates back over two thousand years ago, see Timeline of electromagnetism. The ancients must have been acquainted with the effects of… …
40Off-Air Pickup — An Off Air Pickup was a method used by some small market television stations in the United States to receive and relay network programming. In the 1950s, a network of AT T coaxial cable and microwave relays known as Long Lines was constructed.… …
