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...th-century English—an overview |url=https://public.oed.com/blog/nineteenth-century-english-an-overview/ |access-date=7 November 2020 |website=Oxford English D ...ng scientific progress is the ease of scientific discovery. In many cases, from planetary science to mammalian biology, the ease of discovery since the 170 ...

...e 19th and 20th centuries with the realization that [[ionizing radiation]] from natural and artificial sources can have harmful effects on living organisms ...relessly, increasing awareness of the dangers of [[radiation]] in the 20th century led to the implementation of various preventive measures worldwide, resulti ...