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  2. TreasuryDirect - Wikipedia

    en.wikipedia.org/wiki/TreasuryDirect

    Launched. 2002. ( 2002) TreasuryDirect is a website run by the Bureau of the Fiscal Service under the United States Department of the Treasury that allows US individual investors to purchase treasury securities, such as savings bonds, directly from the US government. It enables people to manage their investments online, including connecting ...

  3. International Space Station - Wikipedia

    en.wikipedia.org/wiki/International_Space_Station

    The International Space Station (ISS) is a large space station assembled and maintained in low Earth orbit by a collaboration of five space agencies and their contractors: NASA (United States), Roscosmos (Russia), JAXA (Japan), ESA (Europe), and CSA (Canada).

  4. Isaac Newton - Wikipedia

    en.wikipedia.org/wiki/Isaac_Newton

    Whig. Signature. Sir Isaac Newton FRS (25 December 1642 – 20 March 1726/27 [a]) was an English polymath active as a mathematician, physicist, astronomer, alchemist, theologian, and author who was described in his time as a natural philosopher. [7] He was a key figure in the Scientific Revolution and the Enlightenment that followed.

  5. NATO - Wikipedia

    en.wikipedia.org/wiki/NATO

    NATO was established on 4 April 1949 by the signing of the North Atlantic Treaty (Washington Treaty). The 12 founding members of the alliance were Belgium, Canada, Denmark, France, Iceland, Italy, Luxembourg, the Netherlands, Norway, Portugal, the United Kingdom, and the United States. [126] Four new members joined during the Cold War: Greece ...

  6. Timeline for the day of the September 11 attacks - Wikipedia

    en.wikipedia.org/wiki/Timeline_for_the_day_of...

    8:50 – 8:54 (approx.): Flight 77 is hijacked above southern Ohio, turning to the southeast. The transponder is turned off by hijacker-pilot Hani Hanjour. 9:03:02: Flight 175 crashes into the south face of the South Tower (2 WTC) of the World Trade Center, between floors 77 and 85.

  7. Matrix (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Matrix_(mathematics)

    In mathematics, a matrix ( pl.: matrices) is a rectangular array or table of numbers, symbols, or expressions, arranged in rows and columns, which is used to represent a mathematical object or a property of such an object. For example, is a matrix with two rows and three columns. This is often referred to as a "two by three matrix", a " matrix ...

  8. Erythrocyte sedimentation rate - Wikipedia

    en.wikipedia.org/wiki/Erythrocyte_sedimentation_rate

    30341-2. The erythrocyte sedimentation rate ( ESR or sed rate) is the rate at which red blood cells in anticoagulated whole blood descend in a standardized tube over a period of one hour. It is a common hematology test, and is a non-specific measure of inflammation . To perform the test, anticoagulated blood is traditionally placed in an ...

  9. Half-birthday - Wikipedia

    en.wikipedia.org/wiki/Half-birthday

    A half-birthday is a day approximately six months before or after the anniversary of a person's birth. It is sometimes marked by people whose birthday falls near major holidays, the celebration of which may overshadow celebration of the birthday. [1] It may also be marked by students whose birthday does not occur during the regular school year ...

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