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  2. Down syndrome - Wikipedia

    en.wikipedia.org/wiki/Down_syndrome

    Trisomy 21. Down syndrome (also known by the karyotype 47,XX,+21 for females and 47,XY,+21 for males) [98] is mostly caused by a failure of the 21st chromosome to separate during egg or sperm development, known as nondisjunction. [91] As a result, a sperm or egg cell is produced with an extra copy of chromosome 21; this cell thus has 24 ...

  3. Jessica Ennis-Hill - Wikipedia

    en.wikipedia.org/wiki/Jessica_Ennis-Hill

    Jessica Ennis-Hill. Dame Jessica Ennis-Hill[1] DBE OLY (née Ennis; born 28 January 1986 [3]) is a British retired athlete, specialising in the heptathlon and 100 metres hurdles. As a competitor in heptathlon, she is the 2012 Olympic champion, a three-time world champion (2009, 2011, 2015), and the 2010 European champion. [4][5] She is also the ...

  4. Chicago - Wikipedia

    en.wikipedia.org/wiki/Chicago

    0428803. Website. chicago.gov. Chicago[ a ] is the most populous city in the U.S. state of Illinois and in the Midwestern United States. With a population of 2,746,388, as of the 2020 census, [ 9 ] it is the third-most populous city in the United States after New York City and Los Angeles.

  5. Denisovan - Wikipedia

    en.wikipedia.org/wiki/Denisovan

    Using the percent distance from human–chimpanzee last common ancestor, Denisovans/Neanderthals split from modern humans about 804,000 years ago, and from each other 640,000 years ago. [25] Using a mutation rate of 1 × 10 −9 or 0.5 × 10 −9 per base pair (bp) per year, the Neanderthal/Denisovan split occurred around either 236–190,000 ...

  6. Fermi paradox - Wikipedia

    en.wikipedia.org/wiki/Fermi_paradox

    This is an accepted version of this page This is the latest accepted revision, reviewed on 23 September 2024. Discrepancy between lack of evidence of advanced alien life and apparently high likelihood it exists This article is about the absence of clear evidence of extraterrestrial life. For a type of estimation problem, see Fermi problem. Enrico Fermi (Los Alamos 1945) The Fermi paradox is ...

  7. M1 Abrams - Wikipedia

    en.wikipedia.org/wiki/M1_Abrams

    The M1 Abrams (/ ˈeɪbrəmz /) [10] is a third-generation American main battle tank designed by Chrysler Defense (now General Dynamics Land Systems) and named for General Creighton Abrams. Conceived for modern armored ground warfare, it is one of the heaviest tanks in service at nearly 73.6 short tons (66.8 metric tons).

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