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| nationality = [[Chilean American]] ...on, via Dirac's notation | journal=American Journal of Physics | publisher=American Association of Physics Teachers (AAPT) | volume=65 | issue=7 | year=1997 | ...

...ad solved the problem in late 1949, he was frustrated to find that a young American mathematician [[Leon Henkin]], had also created a proof.<ref name="Enc" /> ...Turing himself, considered one of the greatest mathematicians of the 20th century, had worked on breaking the device. The fact that the Germans had so compre ...

...2012|title=How Has Stephen Hawking Lived to 70 with ALS?|work=[[Scientific American]]|url=http://www.scientificamerican.com/article/stephen-hawking-als/|url-st ...British Agriculture|great agricultural depression]] during the early 20th century.<ref name="SA" /> His paternal great-grandmother saved the family from fina ...

{{Use American English|date=November 2022}} ...the human population will begin to decline in the second half of the 21st century.<ref>{{Cite news |last1=Cave |first1=Damien |last2=Bubola |first2=Emma |las ...

...[[history of Islam]], traditionally dated from the 8th century to the 13th century.<ref name=Saliba>{{cite book|last=Saliba |first=George |author-link=George ...phor of a [[Golden age (metaphor)|golden age]] began to be applied in 19th-century literature about [[Islamic history]], in the context of the western aesthet ...

==Recorded history before 12th century== ...Oxford|access-date=14 October 2014|url=http://www.visitoruk.com/Oxford/8th-century-T4311.html}}</ref> ...

...s, that tells us what the tree would normally be worth.<ref>Eric Rutkow, ''American Canopy: Trees, Forests, and the Making of a Nation''. Scribner, 2012.</ref> ...Charles Tilly]]). Almost all socialist countries that appeared in the 20th century arose out of wars. ...

...=https://www.apa.org/monitor/2023/03/cover-new-concept-of-aging |publisher=American Psychological Association |date=March 1, 2023 |periodical= Monitor on Psych ...e journal |last=roscigno |first=vincent j. |date=2010 |title=ageism in the american workplace |url=https://www.jstor.org/stable/41960075 |journal=Contexts |vol ...