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Chicago Seven

(Encyclopedia)Chicago Seven, group of political activists, originally eight in number, who led protests at the Democratic National Convention in Chicago in 1968 and were charged with criminal conspiracy and incitem...

Clement VII, pope

(Encyclopedia)Clement VII, c.1475–1534, pope (1523–34), a Florentine named Giulio de' Medici; successor of Adrian VI. He was the nephew of Lorenzo de' Medici and was therefore first cousin of Pope Leo X. In 151...

extinction

(Encyclopedia)extinction, in biology, disappearance of species of living organisms. Extinction usually occurs as a result of changed conditions to which the species is not suited. If no member of the affected speci...

impedance

(Encyclopedia)impedance, in electricity, measure in ohms of the degree to which an electric circuit resists the flow of electric current when a voltage is impressed across its terminals. Impedance is expressed as t...

Flaubert, Gustave

(Encyclopedia)Flaubert, Gustave güstävˈ flōbĕrˈ [key], 1821–80, French novelist, regarded as one of the supreme masters of the realistic novel. He was a scrupulous, slow writer, intent on the exact word (le...

American Indian Movement

(Encyclopedia)American Indian Movement (AIM), Native American civil-rights activist organization, founded in 1968 to encourage self-determination among Native Americans and to establish international re...

Muybridge, Eadweard

(Encyclopedia)Muybridge, Eadweard ĕdˈwərd mīˈbrĭj [key], 1830–1904, English-born photographer and student of animal locomotion. Muybridge changed his name from Edward James Muggeridge. A gifted and obsessed...

Lyme disease

(Encyclopedia)Lyme disease or Lyme borreliosis, a nonfatal bacterial infection that causes symptoms ranging from fever and headache to a painful swelling of the joints. The first American case of Lyme's characteris...

parthenogenesis

(Encyclopedia)parthenogenesis pärˌthənōjĕnˈəsĭs [key] [Gr.,=virgin birth], in biology, a form of reproduction in which the ovum develops into a new individual without fertilization. Natural parthenogenesis ...

Bent's Fort

(Encyclopedia)Bent's Fort, trading post of the American West, on the Arkansas River in present-day SE Colorado, E of Rocky Ford and La Junta and several miles above the mouth of the Purgatoire. The trading company ...