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  2. 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 ...

  3. Transgender personnel in the United States military - Wikipedia

    en.wikipedia.org/wiki/Transgender_personnel_in...

    From at least 1960 and possibly earlier, Executive Order 10450 was applied to ban transgender individuals from serving in the United States military. From June 30, 2016, to January 1, 2018, transgender individuals in the United States military were allowed to serve in their identified or assigned gender upon completing transition.

  4. Montreal Protocol - Wikipedia

    en.wikipedia.org/wiki/Montreal_Protocol

    The following year, a group of countries, including the United States, Canada, the Nordic Countries, and Switzerland, proposed a worldwide ban on "nonessential" uses of CFCs in spray cans. [ 35 ] Then, in 1985, British Antarctic Survey scientists Joe Farman , Brian Gardiner and Jon Shanklin published results of abnormally low ozone ...

  5. List of alcohol laws of the United States - Wikipedia

    en.wikipedia.org/wiki/List_of_alcohol_laws_of...

    (Sun-Sat) 6:00 am – 1:30 am [78] Sales permitted until 3:00 am in those Kansas City and St. Louis bars grandfathered into the ability to double as liquor stores. Yes 21 Parents and guardians may furnish alcohol to their children. [79] One of the most alcohol-permissive states, perhaps only behind Nevada and Louisiana: No open container law. [80]

  6. Education in the United States - Wikipedia

    en.wikipedia.org/wiki/Education_in_the_United_States

    The 1983 National Commission on Excellence in Education report, famously titled A Nation at Risk, touched off a wave of federal, state, and local reform efforts, but by 1990 the country still spent only 2% of its budget on education, compared with 30% on support for the elderly. [53]

  7. Gamma-ray burst - Wikipedia

    en.wikipedia.org/wiki/Gamma-ray_burst

    The highest energy light observed from a gamma-ray burst was one teraelectronvolt, from GRB 190114C in 2019. [51] (Note, this is about a thousand times lower energy than the highest energy light observed from any source, which is 1.4 petaelectronvolts as of the year 2021. [52])

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