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opal

(Encyclopedia)opal ōˈpəl [key], a mineral consisting of poorly crystalline to amorphous silica, SiO2·nH2O; the water content is quite variable but usually ranges from 3% to 10%. Common opal is usually colorless...

Hofstadter, Richard

(Encyclopedia)Hofstadter, Richard hōfˈstătˌər, hŏfˈ–, hôfˈ– [key], 1916–70, American historian, b. Buffalo, N.Y. He received his Ph.D. from Columbia in 1942 and began teaching there in 1946, becoming...

Hughes, Howard Robard

(Encyclopedia)Hughes, Howard Robard, 1905–76, U.S. business executive, b. Houston. As a young man he inherited (1925) the patent rights to an oil tool drill, which, manufactured by the Hughes Tool Company, formed...

hydra, in zoology

(Encyclopedia)hydra hīˈdrə [key], common name for freshwater organisms in the phylum Cnidaria, which includes jellyfish, sea anemones, and corals. Hydras are widely distributed in lakes, ponds, and sluggish stre...

echidna, in zoology

(Encyclopedia)echidna ĭkĭdˈnə [key] or spiny anteater, animal of the order Monotremata, the egg-laying mammals. A short-legged, grayish brown animal, the echidna is covered with sharp quills and can protect its...

Hampton, Lionel

(Encyclopedia)Hampton, Lionel, 1908?–2002, African-American vibraphonist and bandleader, b. Louisville, Ky. When his family moved to Chicago c.1916, the young Hampton began playing drums in a newsboys' band. He m...

jumping mouse

(Encyclopedia)jumping mouse, rodent slightly larger than the common mouse, found in North America and N Asia, also called the kangaroo mouse. Its long hind legs and tail enable it to leap distances up to 12 ft (3.7...

sunbittern

(Encyclopedia)sunbittern, common name for a graceful, stout-bodied, bitternlike bird, Eurypyga helias. It is named for its wing markings, an orange-chestnut shield set in an orange-buff circle, which looks like a s...

tanuki

(Encyclopedia)tanuki or raccoon dog, omnivorous mammal, Nyctereutes Procyonoides, of the dog family, native to the forests of E Asia. The tanuki is similar in appearance to a dog but has black, masklike facial mark...

basking shark

(Encyclopedia)basking shark, large, plankton-feeding shark, Cetorhinus maximus, inhabiting many oceans of the world, especially in temperate regions. Found singly or in schools of up to 100, it spends much of its t...