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2. Gamma ray - Wikipedia

   en.wikipedia.org/wiki/Gamma_ray

   Gamma-ray sensors are also used for measuring the fluid levels in water and oil industries. [17] Typically, these use Co-60 or Cs-137 isotopes as the radiation source. In the US, gamma ray detectors are beginning to be used as part of the Container Security Initiative (CSI). These machines are advertised to be able to scan 30 containers per hour.

3. Islamic scarf controversy in France - Wikipedia

   en.wikipedia.org/wiki/Islamic_scarf_controversy...

   In France, there is an ongoing social, political, and legal debate concerning the wearing of the hijab and other forms of Islamic coverings in public. The cultural framework of the controversy can be traced to France's history of colonization in North Africa, [1] but escalated into a significant public debate in 1989 when three girls were suspended from school for refusing to remove their ...

4. 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).

5. Pareto principle - Wikipedia

   en.wikipedia.org/wiki/Pareto_principle

   The Pareto principle may apply to fundraising, i.e. 20% of the donors contributing towards 80% of the total. The Pareto principle (also known as the 80/20 rule, the law of the vital few and the principle of factor sparsity [1] [2]) states that for many outcomes, roughly 80% of consequences come from 20% of causes (the "vital few").

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. One-drop rule - Wikipedia

   en.wikipedia.org/wiki/One-drop_rule

   The one-drop rule was a legal principle of racial classification that was prominent in the 20th-century United States. It asserted that any person with even one ancestor of black ancestry ("one drop" of "black blood") [1] [2] is considered black (Negro or colored in historical terms).