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2. Coupon collector's problem - Wikipedia

   en.wikipedia.org/wiki/Coupon_collector's_problem

   Graph of number of coupons, n vs the expected number of trials (i.e., time) needed to collect them all, E (T ) In probability theory, the coupon collector's problem refers to mathematical analysis of "collect all coupons and win" contests.

3. Smoking in the United Kingdom - Wikipedia

   en.wikipedia.org/wiki/Smoking_in_the_United_Kingdom

   "Birdseye". Caricature of William Wills, by Spy published in Vanity Fair in 1893. He made a fortune from cigarettes, but smoked a cigar. According to B.W.E. Alford, in the first century after its founding in Bristol in 1786, Wills was one of many small firms processing loose tobacco for the competitive British market.

4. Gamma-ray burst - Wikipedia

   en.wikipedia.org/wiki/Gamma-ray_burst

   The observation of minutes to hours of X-ray flashes after a short gamma-ray burst is consistent with small particles of a primary object like a neutron star initially swallowed by a black hole in less than two seconds, followed by some hours of lesser energy events, as remaining fragments of tidally disrupted neutron star material (no longer ...

5. Cathode-ray tube - Wikipedia

   en.wikipedia.org/wiki/Cathode-ray_tube

   A cathode-ray tube (CRT) is a vacuum tube containing one or more electron guns, which emit electron beams that are manipulated to display images on a phosphorescent screen. [2] The images may represent electrical waveforms on an oscilloscope , a frame of video on an analog television set (TV), digital raster graphics on a computer monitor , or ...

6. Ban the Box - Wikipedia

   en.wikipedia.org/wiki/Ban_the_Box

   Ban the Box is an American campaign by advocates for ex-offenders aimed at removing the check box that asks if applicants have a criminal record from hiring applications.Its purpose is to enable ex-offenders to display their qualifications in the hiring process before being asked about their criminal records.

7. Burqa by country - Wikipedia

   en.wikipedia.org/wiki/Burqa_by_country

   The burqa is worn by women in various countries. Some countries have banned it in government offices, schools, or in public places and streets. There are currently 16 states that have banned the burqa and niqab, both Muslim-majority countries and non-Muslim countries, including Tunisia, [1] Austria, Denmark, France, Belgium, Tajikistan, Uzbekistan, Bulgaria, [2] Cameroon, Chad, the Republic of ...