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Darwinism

(Encyclopedia)Darwinism, concept of evolution developed in the mid-19th cent. by Charles Robert Darwin. Darwin's meticulously documented observations led him to question the then current belief in special creation ...

air conditioning

(Encyclopedia)CE5 Cross section of air conditioning unit. air conditioning, mechanical process for controlling the humidity, temperature, cleanliness, and circulation of air in buildings and rooms. Indoor air i...

gravitation

(Encyclopedia)gravitation, the attractive force existing between any two particles of matter. The term gravitygravity is commonly used synonymously with gravitation, but in correct usage a definite distinction is...

Dickinson, John

(Encyclopedia)Dickinson, John, 1732–1808, American patriot and statesman, b. Talbot co., Md. After studying law in Philadelphia and in London at the Middle Temple, he developed a highly successful practice in Phi...

Garrison, William Lloyd

(Encyclopedia)Garrison, William Lloyd, 1805–79, American abolitionist, b. Newburyport, Mass. He supplemented his limited schooling with newspaper work and in 1829 went to Baltimore to aid Benjamin Lundy in publis...

Dred Scott Case

(Encyclopedia)Dred Scott Case, argued before the U.S. Supreme Court in 1856–57. It involved the then bitterly contested issue of the status of slavery in the federal territories. In 1834, Dred Scott, a black slav...

Burlington, cities, United States

(Encyclopedia)Burlington. 1 City (2020 pop. 23,982), seat of Des Moines co., SE Iowa, on four hills overlooking the Mississippi (spanned there by rail and highway ...

beach

(Encyclopedia)beach, a gently sloping zone where deposits of unconsolidated sediments are subject to wave action at the shore of an ocean or lake. Most of the sediment making up a beach is supplied by rivers or by ...

Philadelphia, city, United States

(Encyclopedia)Philadelphia, city (2020 pop. 1,603,797), coextensive with Philadelphia co., SE Pa., on the Delaware River c.100 mi (160 km) upstream at the influx of t...

maser

(Encyclopedia)maser māˈzər [key], device for creation, amplification, and transmission of an intense, highly focused beam of high-frequency radio waves. The name maser is an acronym for microwave amplification b...