to leave a vacuum
81Non-topological soliton — In quantum field theory, a non topological soliton (NTS) is a field configuration possessing, contrary to a topological one, a conserved Noether charge and stable against transformation into usual particles of this field for the following reason …
82Loop quantum gravity — Not to be confused with the path integral formulation of LQG, see spin foam. This article is about LQG in its Canonical formulation.. Beyond the Standard Model …
83Perpetual motion — For other uses, see Perpetual motion (disambiguation). Robert Fludd s 1618 water screw perpetual motion machine from a 1660 wood engraving. This device is widely credited as the first recorded attempt to describe such a device in order to produce …
84Kirby Company — Infobox Company company name = Kirby Company company company type = subsidiary of Berkshire Hathaway foundation = 1914 location = Cleveland, Ohio industry = Consumer products products = Vacuum cleaners revenue = operating income = net income =… …
85History of the steam engine — This article primarily deals with the history of the reciprocating type steam engine. The parallel development of turbine type engines is described in the steam turbine article. The history of the steam engine stretches back as far as the first… …
86Abortion — Induced abortion Classification and external resources ICD 10 O04 …
87Thermionic emission — Closeup of the filament on a low pressure mercury gas discharge lamp showing white thermionic emission mix coating on the central portion of the coil. Typically made of a mixture of barium, strontium and calcium oxides, the coating is sputtered… …
88Invention of radio — Great Radio Controversy redirects here. For the album by the band Tesla, see The Great Radio Controversy. Contents 1 Physics of wireless signalling 2 Theory of electromagnetism …
89Electronic packaging — is a major discipline within the field of electronic engineering, and includes a wide variety of technologies. It refers to enclosures and protective features built into the product itself, and not to shipping containers. It applies both to end… …
90List of MythBusters episodes — This is the episode list of the popular science television series MythBusters which airs on Discovery Channel. There is no consistent system for organizing MythBusters episodes into seasons. The show does not follow a typical calendar of on and… …
