Columbia Encyclopedia

(Encyclopedia) gamma radiation, high-energy photons emitted as one of the three types of radiation resulting from natural radioactivity. It is the most energetic form of electromagnetic radiation, with a very short ...

(Encyclopedia) Johnson, Philip Cortelyou, 1906–2005, American architect, museum curator, and historian, b. Cleveland, grad. Harvard Univ. (B.A., 1927). One of the first Americans to study modern European architect...

(Encyclopedia) Victor Emmanuel II, 1820–78, king of Sardinia (1849–61) and first king of united Italy (1861–78). He fought in the war of 1848–49 against Austrian rule in Lombardy-Venetia and ascended the thr...

(Encyclopedia) heart disease, any of several abnormalities of the heart and its function in maintaining blood circulation. Heart disease is the cause of approximately half the deaths in the United States each year. ...

(Encyclopedia) ultraviolet radiation, invisible electromagnetic radiation between visible violet light and X rays; it ranges in wavelength from about 400 to 4 nanometers and in frequency from about 1015 to 1017 hert...

(Encyclopedia) Lagrange, Joseph Louis, Comte zhôzĕfˈ lwē kôNt lägräNzhˈ [key], 1736–1813, French mathematician and astronomer, b. Turin, of French and Italian descent. Before the age of 20 he was professor...

(Encyclopedia) white dwarf, in astronomy, a type of star that is abnormally faint for its white-hot temperature (see mass-luminosity relation). Typically, a white dwarf star has the mass of the sun and the radius of...

(Encyclopedia) Patterson, family of American journalists. Robert Wilson Patterson, 1850–1910, b. Chicago, grad. Williams, 1871, became (1871) a reporter on the Chicago Times and after 1873 was attached to the Chic...

(Encyclopedia) hepatitis hĕpˌətīˈtĭs [key], inflammation of the liver. There are many types of hepatitis. Causes include viruses, toxic chemicals, alcohol consumption, parasites and bacteria, and certain drugs...

(Encyclopedia) eugenics yo͞ojĕnˈĭks [key], study of human genetics and of methods to improve the inherited characteristics, physical and mental, of the human race. Efforts to improve the human race through bette...