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  2. 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).

  3. Charlemagne - Wikipedia

    en.wikipedia.org/wiki/Charlemagne

    e. Charlemagne [b] ( / ˈʃɑːrləmeɪn, ˌʃɑːrləˈmeɪn / SHAR-lə-mayn, -⁠MAYN; 2 April 748 [a] – 28 January 814) was King of the Franks from 768, King of the Lombards from 774, and Emperor of what is now known as the Carolingian Empire from 800, holding these titles until his death in 814. He united most of Western and Central ...

  4. Temu (marketplace) - Wikipedia

    en.wikipedia.org/wiki/Temu_(marketplace)

    temu .com. Launched. September 2022. Whaleco Technology Limited, [8] doing business as Temu, is an online marketplace operated by the Chinese e-commerce company PDD Holdings. [7] [9] It offers heavily discounted consumer goods [10] which are mostly shipped to consumers directly from China. [11] [12]

  5. Hydrogen peroxide - Wikipedia

    en.wikipedia.org/wiki/Hydrogen_peroxide

    Hydrogen peroxide ( H2O2) is a nonplanar molecule with (twisted) C 2 symmetry; this was first shown by Paul-Antoine Giguère in 1950 using infrared spectroscopy. [9] [10] Although the O−O bond is a single bond, the molecule has a relatively high rotational barrier of 386 cm −1 (4.62 kJ / mol) for rotation between enantiomers via the trans ...

  6. Rent control in the United States - Wikipedia

    en.wikipedia.org/wiki/Rent_control_in_the_United...

    New York State has had the longest history of rent controls, since 1920. New York City contains the majority of units covered by rent control. Rent control laws have stayed on the books for decades in New York because of an inadequate supply of "decent, affordable housing". The worsening in the rental market led to the enactment of the Rent Stabilization Law of 1969, which aimed to help ...

  7. 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 ...