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mammal

(Encyclopedia)mammal, an animal of the highest class of vertebrates, the Mammalia. The female has mammary glands, which secrete milk for the nourishment of the young after birth. In the majority of mammals the body...

chain reaction

(Encyclopedia)CE5 Chain reaction: A neutron (n) strikes the uranium nucleus (U-235), causing it to split into fission products A and B and release two neutrons. These neutrons can in turn cause further fissions....

blast furnace

(Encyclopedia)CE5 Blast furnace for production of iron blast furnace, structure used chiefly in smelting. The principle involved in this means of extracting metals is that of the reduction of the ores by the ac...

Hague, Frank

(Encyclopedia)Hague, Frank hāg [key], 1876–1956, American politician, mayor of Jersey City, N.J., b. Jersey City. He worked his way up through the ranks of the local Democratic machine and was elected (1913) to ...

Geertgen tot Sint Jans

(Encyclopedia)Geertgen tot Sint Jans gārtˈgən tôt sĭnt yäns [key], fl. latter half of 15th cent., Dutch painter. Geertgen is the earliest painter of record in Haarlem. He may have gone to Ghent and had some c...

Isthmian games

(Encyclopedia)Isthmian games ĭsˈmēən [key], athletic events organized c.581 b.c. They were held at Corinth in the spring of the first and third years of the Olympiad, and they honored Palaemon as well as Poseid...

Kahn, Robert Elliot

(Encyclopedia)Kahn, Robert Elliot, 1938–, American computer scientist, b. Brooklyn, N.Y., B.E.E. City College of New York, 1960, Ph.D. Princeton, 1964. With Vinton Cerf, he is responsible for the design and imple...

Eastman, George

(Encyclopedia)Eastman, George, 1854–1932, American inventor, industrialist, and philanthropist, b. Waterville, N.Y. By mass production of his photographic inventions, Eastman enormously stimulated the development...

Aki, Keiiti

(Encyclopedia)Aki, Keiiti, 1930–2005, American seismologist, b. Yokohama, Japan, Ph.D. Univ. of Tokyo, 1958. Associated with the Univ. of Tokyo 's Earthquake Research Institute from 1963, Aki joined the faculty o...

clepsydra

(Encyclopedia)clepsydra klĕpˈsĭdrə [key] or water clock, ancient device for measuring time by means of the flow of water from a container. A simple form of clepsydra was an earthenware vessel with a small openi...