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  1. 5 天前 · Rosalind Franklin. / 51.5447; -0.2399. Rosalind Elsie Franklin (25 July 1920 – 16 April 1958) [ 1] was a British chemist and X-ray crystallographer whose work was central to the understanding of the molecular structures of DNA (deoxyribonucleic acid), RNA (ribonucleic acid), viruses, coal, and graphite. [ 2]

  2. en.wikipedia.org › wiki › Marie_CurieMarie Curie - Wikipedia

    1 天前 · Maria Salomea Skłodowska-Curie[ a] ( Polish: [ˈmarja salɔˈmɛa skwɔˈdɔfska kʲiˈri] ⓘ; née Skłodowska; 7 November 1867 – 4 July 1934), known simply as Marie Curie ( / ˈkjʊəri / KURE-ee, [ 1] French: [maʁi kyʁi] ), was a Polish and naturalised -French physicist and chemist who conducted pioneering research on ...

  3. 1 天前 · The most widely used renewable energy types are solar energy, wind power, and hydropower. Bioenergy and geothermal power are also significant in some countries. Some also consider nuclear power a renewable power source, although this is controversial.

  4. 2 天前 · About 68% of values drawn from a normal distribution are within one standard deviation σ from the mean; about 95% of the values lie within two standard deviations; and about 99.7% are within three standard deviations. [ 6] This fact is known as the 68–95–99.7 (empirical) rule, or the 3-sigma rule .

  5. en.wikipedia.org › wiki › NitrogenNitrogen - Wikipedia

    2 天前 · Nitrogen is a chemical element; it has symbol N and atomic number 7. Nitrogen is a nonmetal and the lightest member of group 15 of the periodic table, often called the pnictogens. It is a common element in the universe, estimated at seventh in total abundance in the Milky Way and the Solar System.

  6. en.wikipedia.org › wiki › InternetInternet - Wikipedia

    4 天前 · e. The Internet (or internet) [ a] is the global system of interconnected computer networks that uses the Internet protocol suite (TCP/IP) [ b] to communicate between networks and devices. It is a network of networks that consists of private, public, academic, business, and government networks of local to global scope, linked by a broad array ...

  7. 3 天前 · Modern definitions express trigonometric functions as infinite series or as solutions of differential equations. This allows extending the domain of sine and cosine functions to the whole complex plane, and the domain of the other trigonometric functions to the complex plane with some isolated points removed.

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