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  2. Russian Revolution - Wikipedia

    en.wikipedia.org/wiki/Russian_Revolution

    These 13 provinces held 37% of Russia's population and 20% of the membership of the Bolshevik faction. [ 32 ] In August, poor and misleading communication led General Lavr Kornilov , the recently appointed Supreme Commander of Russian military forces, to believe that the Petrograd government had already been captured by radicals, or was in ...

  3. Oxygen concentrator - Wikipedia

    en.wikipedia.org/wiki/Oxygen_concentrator

    In the first half-cycle, the first cylinder receives air from the compressor, which lasts about 3 seconds. During that time, the pressure in the first cylinder rises from atmospheric to about 2.5 times normal atmospheric pressure (typically 20 psi/138 kPa gauge, or 2.36 atmospheres absolute) and the zeolite becomes saturated with nitrogen.

  4. Recycling codes - Wikipedia

    en.wikipedia.org/wiki/Recycling_codes

    Recycling codes on products. Recycling codes are used to identify the materials out of which the item is made, to facilitate easier recycling process.The presence on an item of a recycling code, a chasing arrows logo, or a resin code, is not an automatic indicator that a material is recyclable; it is an explanation of what the item is made of.

  5. Ozone - Wikipedia

    en.wikipedia.org/wiki/Ozone

    Ozone (/ ˈ oʊ z oʊ n /) (or trioxygen) is an inorganic molecule with the chemical formula O 3.It is a pale blue gas with a distinctively pungent smell. It is an allotrope of oxygen that is much less stable than the diatomic allotrope O

  6. Solar power - Wikipedia

    en.wikipedia.org/wiki/Solar_power

    Download QR code; Wikidata item; Print/export ... [20] As of 2022 ... particularly in off-grid applications and for future 100% renewable energy scenarios. ...

  7. Parkland high school shooting - Wikipedia

    en.wikipedia.org/wiki/Parkland_high_school_shooting

    The Parkland high school shooting was a mass shooting that occurred on February 14, 2018, when 19-year-old Nikolas Cruz opened fire on students and staff at Marjory Stoneman Douglas High School in the Miami metropolitan area city of Parkland, Florida, killing 17 people [note 2] and injuring 17 others.