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2. Ultraviolet - Wikipedia

   en.wikipedia.org/wiki/Ultraviolet

   Ultraviolet ( UV) light is electromagnetic radiation of wavelengths of 10–400 nanometers, shorter than that of visible light, but longer than X-rays. UV radiation is present in sunlight, and constitutes about 10% of the total electromagnetic radiation output from the Sun. It is also produced by electric arcs, Cherenkov radiation, and ...

3. Soft error - Wikipedia

   en.wikipedia.org/wiki/Soft_error

   The average rate of cosmic-ray soft errors is inversely proportional to sunspot activity. That is, the average number of cosmic-ray soft errors decreases during the active portion of the sunspot cycle and increases during the quiet portion. This counter-intuitive result occurs for two reasons.

4. Battle of Britain - Wikipedia

   en.wikipedia.org/wiki/Battle_of_Britain

   The Battle of Britain ( German: Luftschlacht um England, "air battle for England") was a military campaign of the Second World War, in which the Royal Air Force (RAF) and the Fleet Air Arm (FAA) of the Royal Navy defended the United Kingdom (UK) against large-scale attacks by Nazi Germany 's air force, the Luftwaffe.

5. List of smoking bans - Wikipedia

   en.wikipedia.org/wiki/List_of_smoking_bans

   It introduced a 20 colones tax per cigarette and prohibits any form of tobacco advertising, the use of misleading terms such as "light" or "mild" and the sale of small packages or individual cigarettes. It also prohibits bars and restaurants from selling cigarettes. Violators will be fined a minimum of 180.000 colones (US$355). Croatia

6. Airbnb - Wikipedia

   en.wikipedia.org/wiki/Airbnb

   Airbnb, Inc. ( / ˌɛərˌbiːɛnˈbiː / AIR-BEE-en-BEE) is an American company operating an online marketplace for short- and long-term homestays and experiences. The company acts as a broker and charges a commission from each booking. The company was founded in 2008 by Brian Chesky, Nathan Blecharczyk, and Joe Gebbia.

7. Total order - Wikipedia

   en.wikipedia.org/wiki/Total_order

   Total order. In mathematics, a total order or linear order is a partial order in which any two elements are comparable. That is, a total order is a binary relation on some set , which satisfies the following for all and in : ( reflexive ). If and then ( transitive ). If and then ( antisymmetric ).