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cerium

(Encyclopedia)cerium sērˈēəm [key] [from the asteroid Ceres], metallic chemical element; symbol Ce; at. no. 58; at. wt. 140.116; m.p. 799℃; b.p. 3,426℃; sp. gr. 6.77 at 25℃; valence +3 or +4. Cerium is a ...

Formula One

(Encyclopedia)Formula One (F1), type of racecar used in Grand Prix automobile racing. Capable of speeds exceeding 230 mph (370 kph), the technologically sophisticated F1 cars are low-slung, open-wheeled, single-sea...

Marine Corps, United States

(Encyclopedia)Marine Corps, United States, military corps that forms a separate service within the U.S. Dept. of the Navy. The commandant of the Marine Corps is a member of the Joint Chiefs of Staff. During conflic...

torpedo , in naval warfare

(Encyclopedia)torpedo, in naval warfare, a self-propelled submarine projectile loaded with explosives, used for the destruction of enemy ships. Although there were attempts at subsurface warfare in the 16th and 17t...

Gramm-Rudman-Hollings Act

(Encyclopedia)Gramm-Rudman-Hollings Act, officially the Balanced Budget and Emergency Deficit Control Act of 1985, U.S. budget deficit reduction measure. The law provided for automatic spending cuts to take effect ...

biofeedback

(Encyclopedia)biofeedback, method for learning to increase one's ability to control biological responses, such as blood pressure, muscle tension, and heart rate. Sophisticated instruments are often used to measure ...

Hopkins

(Encyclopedia)Hopkins, city (2020 pop. 19,079), Hennepin co., SE Minn., a suburb of Minneapolis; inc. as West Minneapolis 1893, name changed 1928. The city manufactur...

Herndon

(Encyclopedia)Herndon, town (2020 pop. 24,655), Fairfax co., N Va., inc. 1874, rechartered 1938. A suburb of Washington, D.C., Herndon has a mix of light and high-tec...

bone black

(Encyclopedia)bone black, solid black material, largely carbon, produced by heating animal bones to high temperatures in the absence of air so as to drive off volatile substances. Finely divided bone black is usefu...

tornado

(Encyclopedia)tornado, dark, funnel-shaped cloud containing violently rotating air that develops below a heavy cumulonimbus cloud mass and extends toward the earth. The funnel twists about, rises and falls, and whe...