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  1. What links here Related changes Upload file Special pages Permanent link Page information Cite this page Get shortened URL Download QR code The S&P 500 is a stock market index maintained by S&P Dow Jones Indices.It comprises 503 common stocks which are issued by 500 large-cap companies traded on American stock exchanges (including the 30 companies that compose the Dow Jones Industrial Average).

  2. Polytetrafluoroethylene is a fluorocarbon solid, as it is a high- molecular-weight polymer consisting wholly of carbon and fluorine. PTFE is hydrophobic: neither water nor water-containing substances wet PTFE, as fluorocarbons exhibit only small London dispersion forces due to the low electric polarizability of fluorine.

  3. Principal component analysis (PCA) is a linear dimensionality reduction technique with applications in exploratory data analysis, visualization and data preprocessing. The data is linearly transformed onto a new coordinate system such that the directions (principal components) capturing the largest variation in the data can be easily identified.

  4. en.wikipedia.org › wiki › DNADNA - Wikipedia

    In a DNA double helix, each type of nucleobase on one strand bonds with just one type of nucleobase on the other strand. This is called complementary base pairing.Purines form hydrogen bonds to pyrimidines, with adenine bonding only to thymine in two hydrogen bonds, and cytosine bonding only to guanine in three hydrogen bonds. . This arrangement of two nucleotides binding together across the ...

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

    Copper is a chemical element; it has symbol Cu (from Latin cuprum) and atomic number 29. It is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. A freshly exposed surface of pure copper has a pinkish-orange color. Copper is used as a conductor of heat and electricity, as a building material, and as a ...

  6. Warren Edward Buffett (/ˈbʌfɪt/ BUF-it; born August 30, 1930)[2] is an American businessman, investor, and philanthropist who currently serves as the co-founder, chairman and CEO of Berkshire Hathaway. As a result of his investment success, Buffett is one of the best-known investors in the world. As of April 2024, he had a net worth of $139 ...

  7. This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these template messages) This article relies excessively on references to primary sources. Please improve this article by adding secondary or tertiary sources. Find sources: "List of Linux distributions" – news ...

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