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In the 19th century, it acquired a meaning more closely related to biological deformities, mostly in the field of botany. Currently, its most instrumental meaning is that of the medical study of teratogenesis, congenital malformations or individuals with significant malformations. Historically, people have used many pejorative terms to describe ...
An Encyclopedia of World History (5th ed. 1973); highly detailed outline of events online; Murphy, Derrick. AS/A-level 19th & 20th century European & world history (2002) online; Morris, Richard B. and Graham W. Irwin, eds. Harper Encyclopedia of the Modern World: A Concise Reference History from 1760 to the Present (1970) online; Gladden, Rhodes.
The 19th century began on 1 January 1801 (represented by the Roman numerals MDCCCI), and ended on 31 December 1900 (MDCCCXCX). It was the 9th century of the 2nd millennium. It was the 9th century of the 2nd millennium.
Possibly introduction of rats and cats, although it is not attested by the time they arrived in the 18th and 19th centuries. [185] 1670-1950 [73] [186] Larger Malagasy hippopotamus: Hippopotamus laloumena: Eastern Madagascar Increased human and cattle pressure after the introduction of prickly pear farming. [111]
For a timeline of events from 1801 to 1900, see Timeline of the 19th century; For a timeline of events from 1901 to 1945, see Timeline of the 20th century. For 1914–1918, see Timeline of World War I; For 1939–1945 see Timeline of World War II
Artist's depiction of the end-Cretaceous impact event. Since the 19th century, a significant amount of research has been conducted on the Cretaceous–Paleogene extinction event, the mass extinction that ended the dinosaur-dominated Mesozoic Era and set the stage for the Age of Mammals, or Cenozoic Era. A chronology of this research is ...
The 20th century saw a major renewal of interest in mass extinction events and their effect on the course of the history of life. This was particularly true after 1980 when Luis and Walter Alvarez put forward the Alvarez hypothesis claiming that an impact event caused the Cretaceous–Paleogene extinction event , which killed off the non-avian ...
4th century BC: The first true formal system is constructed by Pāṇini in his Sanskrit grammar. [34] [35] 4th century BC: Eudoxus of Cnidus states the Archimedean property. [36] 4th century BC: Thaetetus shows that square roots are either integer or irrational. 4th century BC: Thaetetus enumerates the Platonic solids, an early work in graph ...