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2. Fraction - Wikipedia

   en.wikipedia.org/wiki/Fraction

   Common fractions can be positive or negative, and they can be proper or improper (see below). Compound fractions, complex fractions, mixed numerals, and decimals (see below) are not common fractions; though, unless irrational, they can be evaluated to a common fraction. A unit fraction is a common fraction with a numerator of 1 (e.g., ⁠ 1 / 7

3. Decompression practice - Wikipedia

   en.wikipedia.org/wiki/Decompression_stops

   Decompression can be accelerated by the use of breathing gases during ascent with lowered inert gas fractions (as a result of increased oxygen fraction). This will result in a greater diffusion gradient for a given ambient pressure, and consequently accelerated decompression for a relatively low risk of bubble formation. [ 38 ]

4. Chemistry - Wikipedia

   en.wikipedia.org/wiki/Chemistry

   Chemistry is the scientific study of the properties and behavior of matter. [1] It is a physical science within the natural sciences that studies the chemical elements that make up matter and compounds made of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during reactions with other substances.

5. Flight and expulsion of Germans (1944–1950) - Wikipedia

   en.wikipedia.org/wiki/Flight_and_expulsion_of...

   Refugees moving westwards in 1945. During the later stages of World War II and the post-war period, Germans and Volksdeutsche fled and were expelled from various Eastern and Central European countries, including Czechoslovakia, and from the former German provinces of Lower and Upper Silesia, East Prussia, and the eastern parts of Brandenburg and Pomerania (Hinterpommern), which were annexed by ...

6. Circle of fifths - Wikipedia

   en.wikipedia.org/wiki/Circle_of_fifths

   The standard tempered fifth has a frequency ratio of 2 7/12:1 (or about 1.498307077:1), approximately two cents narrower than a justly tuned fifth. Ascending by twelve justly tuned fifths fails to close the circle by an excess of approximately 23.46 cents , roughly a quarter of a semitone , an interval known as the Pythagorean comma .

7. West Virginia - Wikipedia

   en.wikipedia.org/wiki/West_Virginia

   The native vegetation for most of the state was originally mixed hardwood forest of oak, chestnut, maple, beech, and white pine, with willow and American sycamore along the state's waterways. Many of the areas are rich in biodiversity and scenic beauty, a fact appreciated by native West Virginians, who refer to their home as Almost Heaven (from ...