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2. Battle of Trafalgar - Wikipedia

   en.wikipedia.org/wiki/Battle_of_Trafalgar

   The Battle of Trafalgar was a naval engagement that took place on 21 October 1805 between the British Royal Navy and the combined fleets of the French and Spanish Navies during the War of the Third Coalition (August–December 1805) of the Napoleonic Wars (1803–1815).

3. Semiconductor - Wikipedia

   en.wikipedia.org/wiki/Semiconductor

   In a metal, every atom donates at least one free electron for conduction, thus 1 cm 3 of metal contains on the order of 10 22 free electrons, [28] whereas a 1 cm 3 sample of pure germanium at 20 °C contains about 4.2 × 10 22 atoms, but only 2.5 × 10 13 free electrons and 2.5 × 10 13 holes.

4. Water - Wikipedia

   en.wikipedia.org/wiki/Water

   Water is an inorganic compound with the chemical formula H 2 O.It is a transparent, tasteless, odorless, [c] and nearly colorless chemical substance.It is the main constituent of Earth's hydrosphere and the fluids of all known living organisms (in which it acts as a solvent [19]).

5. Fukushima nuclear accident - Wikipedia

   en.wikipedia.org/wiki/Fukushima_nuclear_accident

   This resulted in many residents having to move multiple times until they reached an area outside of the final 20 km evacuation zone. [63]: 309–328 20% of residents who were within the initial 2 km radius had to evacuate more than six times. [66]

6. Hydrochloric acid - Wikipedia

   en.wikipedia.org/wiki/Hydrochloric_acid

   Hydrochloric acid has been used for dissolving calcium carbonate, e.g. such things as de-scaling kettles and for cleaning mortar off brickwork. When used on brickwork the reaction with the mortar only continues until the acid has all been converted, producing calcium chloride , carbon dioxide , and water:

7. 420 (cannabis culture) - Wikipedia

   en.wikipedia.org/wiki/420_(cannabis_culture)

   420, 4:20 or 4/20 (pronounced four-twenty) is cannabis culture slang for marijuana and hashish consumption, especially smoking around the time 4:20 p.m. (16:20). It also refers to cannabis -oriented celebrations that take place annually on April 20 (4/20 in U.S. date form).