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population

(Encyclopedia)population, the inhabitants of a given area, but perhaps most importantly, the human inhabitants of the earth (numbering about 7.5 billion in 2017), who by their increasing numbers and corresponding i...

derecho

(Encyclopedia)derecho dərāˈchō [key], a long-lived windstorm over a wide expanse that is associated with a line of rapidly moving thunderstorms or showers. The winds in a derecho generally exceed 57 mph (92 kph...

center of mass

(Encyclopedia)center of mass, the point at which all the mass of a body may be considered to be concentrated in analyzing its motion. The center of mass of a sphere of uniform density coincides with the center of t...

Leto

(Encyclopedia)Leto lēˈtō [key], in Greek mythology, daughter of the Titans Coeus and Phoebe and mother of Artemis and Apollo. When she conceived twins by Zeus, Hera sent the serpent Python after her and forbade ...

Frankfort, Henri

(Encyclopedia)Frankfort, Henri äNrēˈ [key], 1897–1954, American archaeologist, b. the Netherlands. He directed the excavations of the Egypt Exploration Society (1925–29) and the Iraq expeditions (1929–37) ...

Huizinga, Johan

(Encyclopedia)Huizinga, Johan yōhänˈ hoiˈzĭngə [key], 1872–1945, Dutch historian. He began his academic career in Indian literature, but his reputation rests on his work in the cultural history of the late ...

Place, Francis

(Encyclopedia)Place, Francis, 1771–1854, English radical reformer. A tailor for many years, he educated himself and made his shop a meeting center for radicals and reformers. He was especially active in the trade...

Centers for Disease Control and Prevention

(Encyclopedia)Centers for Disease Control and Prevention (CDC), agency of the U.S. Public Health Service since 1973, with headquarters in Atlanta; it was established in 1946 as the Communicable Disease Center. The ...

Chaadayev, Piotr Yakovlevich

(Encyclopedia)Chaadayev, Piotr Yakovlevich pyôˈtər yäˈkəvlyĭvĭch chädäˈyĕv [key], 1794–1856, Russian philosopher. An aristocrat by birth, he was converted to Roman Catholicism. In 1836 the first of hi...

Smith, William

(Encyclopedia)Smith, William, 1769–1839, English geologist. Through direct observation as a canal-site surveyor, Smith made a systematic study of the geological strata of England and identified the fossils peculi...