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31keyboard instrument — ▪ music Introduction any musical instrument on which different notes can be sounded by pressing a series of keys, push buttons, or parallel levers. In nearly all cases in Western music the keys correspond to consecutive notes in the… …
32Automobile safety — is the avoidance of automobile accidents or the minimization of harmful effects of accidents, in particular as pertaining to human life and health. Numerous safety features have been built into cars for years, some for the safety of car s… …
33Laughton-en-le-Morthen — infobox UK place country = England latitude= 53.38 longitude= 1.21 official name= Laughton en le Morthen civil parish= Laughton en le Morthen population = 2,000 (approx.) metropolitan borough= Rotherham metropolitan county= South Yorkshire region …
34Violin — Infobox Instrument name=Violin names=Fiddle, de: Violine or Geige, fr: Violon, it: Violino classification=String instrument (bowed) range= related= *Violin family (viola, cello) *Viol family (includes double bass) musicians= *List of violinists… …
35Airliner — The Boeing 747 was the first wide body airliner. Pictured is the 747 8I model which first flew in 2011 …
36Spark plug — A spark plug (also, very rarely nowadays, in British English: a sparking plug) is an electrical device that fits into the cylinder head of some internal combustion engines and ignites compressed aerosol gasoline by means of an electric spark.… …
37Quotient ring — In mathematics a quotient ring, also known as factor ring or residue class ring, is a construction in ring theory, quite similar to the factor groups of group theory and the quotient spaces of linear algebra. One starts with a ring R and a two… …
38Red Shift (novel) — infobox Book | name = Red Shift title orig = translator = image caption = First edition cover, showing the folly tower on Mow Cop. author = Alan Garner cover artist = country = United Kingdom language = English series = genre = Fantasy Novel… …
39The Hitchhiker's Guide to the Galaxy Primary and Secondary Phases — The terms Primary Phase and Secondary Phase describe the first two radio series of The Hitchhiker s Guide to the Galaxy . [The spelling of Hitchhiker s Guide has varied in different editions. For consistency this article always spells it this way …
40Pythagoras tree — The Pythagoras tree is a plane fractal constructed from squares. It is named after Pythagoras because each triple of touching squares encloses a right triangle, in a configuration traditionally used to depict the Pythagorean theorem.If the… …
