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2. 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).

3. 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:

4. Mauricio Pochettino - Wikipedia

   en.wikipedia.org/wiki/Mauricio_Pochettino

   Mauricio Roberto Pochettino Trossero (born 2 August 1973) is an Argentine professional football manager and former player who is the head coach of the United States men's national team.

5. 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).

6. 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.

7. Code 128 - Wikipedia

   en.wikipedia.org/wiki/Code_128

   As there are an odd number of digits in the middle of the string, the odd one must use a different code set, but it makes no difference whether this is the first or last; 16 symbols are required in either case: [Start B] 0 9 8 x 1 [Code C] 23 45 67 [Code B] y 2 3 [checksum] [Stop], or [Start B] 0 9 8 x [Code C] 12 34 56 [Code B] 7 y 2 3 ...