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Rickover, Hyman George

(Encyclopedia)Rickover, Hyman George, 1900–1986, American admiral, b. Russia. In World War II he served as head of the electrical section of the navy's Bureau of Ships. After the war he was assigned (1946) to the...

Pea Ridge National Military Park

(Encyclopedia)Pea Ridge National Military Park: see National Parks and Monuments (table)national parks and monuments (table). ...

Ramakrishnan, Venkatraman

(Encyclopedia)Ramakrishnan, Venkatraman, 1952–, American molecular biologist, b. India, Ph.D. Ohio Univ., 1976. He was a researcher at Oak Ridge National Laboratory (1982–83) and at Brookhaven National Laborato...

acorn

(Encyclopedia)acorn: see oak.

tennessine

(Encyclopedia)tennessine tĕnˈəsēn [key], artificially produced radioactive chemical element; symbol Ts; at. no. 117; mass number of most stable isotope 294; m.p., b.p., sp. gr., and valence unknown. Tennessine ...

Timan

(Encyclopedia)Timan tyēmänˈ [key], mountain ridge, c.350 mi (560 km) long, Komi Republic, NE European Russia. The low Timan ridge divides the extensive Dvina-Pechora lowland into the E Pechora River basin and th...

Kittatinny Mountain

(Encyclopedia)Kittatinny Mountain kĭtətĭnˈē [key], ridge of the Appalachian system, extending across NW N.J. from Shawangunk Mt., SE N.Y., to Blue Mt., S central Pa.; rises to High Point (1,803 ft/550 m), the ...

Sedona

(Encyclopedia)Sedona, city (2010 pop. 10,031), Coconino and Yavapai co., N Ariz., 22 mi (35 km) SSW of Flagstaff on Oak Creek in the Coconino National Forest; est. 1902, inc. 1988. Tourism is Sedona's main industry...

promethium

(Encyclopedia)promethium prōmēˈthēəm [key], artificially produced radioactive chemical element; symbol Pm; at. no. 61; mass no. of most stable isotope 145; m.p. 1,042℃; b.p. 3,000℃ (estimated); sp. gr. unk...

Otter, Peaks of

(Encyclopedia)Otter, Peaks of, two peaks, W central Va., in the Blue Ridge, W of Lynchburg. The one, Flat Top, is 4,004 ft (1,220 m) high; the other, Sharp Top, 3,875 ft (1,181 m). They are on national parkland adm...