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2. Sodium hydroxide - Wikipedia

   en.wikipedia.org/wiki/Sodium_hydroxide

   Sodium hydroxide, also known as lye and caustic soda, [1] [2] is an inorganic compound with the formula NaOH.It is a white solid ionic compound consisting of sodium cations Na + and hydroxide anions OH −.

3. Speed of light - Wikipedia

   en.wikipedia.org/wiki/Speed_of_Light

   In 1629, Isaac Beeckman proposed an experiment in which a person observes the flash of a cannon reflecting off a mirror about one mile (1.6 km) away. In 1638, Galileo Galilei proposed an experiment, with an apparent claim to having performed it some years earlier, to measure the speed of light by observing the delay between uncovering a lantern ...

4. Luciano Pavarotti - Wikipedia

   en.wikipedia.org/wiki/Luciano_Pavarotti

   Luciano Pavarotti OMRI (/ ˌ p æ v ə ˈ r ɒ t i /, US also / ˌ p ɑː v-/, Italian: [luˈtʃaːno pavaˈrɔtti]; 12 October 1935 – 6 September 2007) was an Italian operatic tenor who during the late part of his career crossed over into popular music, eventually becoming one of the most acclaimed tenors of all time.

5. List of historically black colleges and universities - Wikipedia

   en.wikipedia.org/wiki/List_of_historically_black...

   This list of historically black colleges and universities (HBCUs) includes institutions of higher education in the United States that were established before 1964 with the intention of primarily serving the Black American community.

6. Gray card - Wikipedia

   en.wikipedia.org/wiki/Gray_card

   Image before (left) and after (right) adjustment with gray card (middle) Gray card from 100 to 0 in 30 steps. A gray card is a middle gray reference, typically used together with a reflective light meter , as a way to produce consistent image exposure and/or color in video production , film , and photography .

7. Net D - Wikipedia

   en.wikipedia.org/wiki/Net_D

   Net 10, net 15, net 30 and net 60 (often hyphenated "net-" and/or followed by "days", e.g., "net 10 days") are payment terms for trade credit, which specify that the net amount (the total outstanding on the invoice) is expected to be paid in full by the buyer within 10, 15, 30 or 60 days of the date when the goods are dispatched or the service ...