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The limit obtained depends on the model used: if the massive photon is described by Proca theory, [60] the experimental upper bound for its mass is about 10 −57 grams; [61] if photon mass is generated by a Higgs mechanism, the experimental upper limit is less sharp, m ≤ 10 −14 eV/c 2 (roughly 2 × 10 −47 g).
In 1893, Colorado was the first state to amend an existing constitution in order to grant women the right to vote, and several other states followed, including Utah and Idaho in 1896, Washington State in 1910, California in 1911, Oregon, Kansas, and Arizona in 1912, Alaska and Illinois in 1913, Montana and Nevada in 1914, New York in 1917 ...
Smallpox was an infectious disease caused by variola virus (often called smallpox virus), which belongs to the genus Orthopoxvirus. [7] [11] The last naturally occurring case was diagnosed in October 1977, and the World Health Organization (WHO) certified the global eradication of the disease in 1980, [10] making smallpox the only human disease to have been eradicated to date.
In 2020, his government responded to the COVID-19 pandemic, announced an "assault-style" weapons ban in response to the 2020 Nova Scotia attacks, and launched a national $10-a-day child care program. He was investigated for a third time by the ethics commissioner for his part in the WE Charity scandal , but was cleared of wrongdoing.
French scientist and industrialist Hilaire de Chardonnet (1838–1924) invented the first artificial textile fiber, artificial silk. [11]Swiss chemist Matthias Eduard Schweizer (1818–1860) discovered that cellulose dissolved in tetraaminecopper dihydroxide.
Visualisation of powers of 10 from one to 1 trillion. A power of 10 is any of the integer powers of the number ten; in other words, ten multiplied by itself a certain number of times (when the power is a positive integer).
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