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Lefkowitz, Robert Joseph

(Encyclopedia)Lefkowitz, Robert Joseph, 1943–, American physician, b. New York City, M.D. Columbia, 1966. Since 1973 Lefkowitz has been a professor at Duke Univ.; he was appointed a Howard Hughes Medical Institut...

stem cells

(Encyclopedia)stem cells, unspecialized human or animal cells that can produce mature specialized body cells and at the same time replicate themselves. Embryonic stem cells are derived from a blastocyst (the blastu...

Niagara Falls, waterfall, United States and Canada

(Encyclopedia)Niagara Falls, in the Niagara River, W N.Y. and S Ont., Canada; one of the most famous spectacles in North America. The falls are on the international line between the cities of Niagara Falls, N.Y., a...

basalt

(Encyclopedia)basalt bəsôltˈ, băsˈôlt [key], fine-grained rock of volcanic origin, dark gray, dark green, brown, reddish, or black in color. Basalt is an igneous rock, i.e., one that has congealed from a molt...

demography

(Encyclopedia)demography dĭmŏgˈrəfē [key], science of human population. Demography represents a fundamental approach to the understanding of human society. Its primary tasks are to ascertain the number of peop...

Natsume Soseki

(Encyclopedia)Natsume Soseki näˈtso͞oˈmĕ sōˈsĕˈkē [key], 1867–1916, Japanese writer. Soseki ranks along with Mori Ogai as one of two giants of early modern Japanese letters. Although Soseki began his ca...

leg

(Encyclopedia)leg, one of the paired limbs of an animal used for support of the body and for locomotion. Properly, the human leg is that portion of the extremity between the foot and the thigh. This section of the ...

act of God

(Encyclopedia)act of God, in law, an accident caused by the operation of extraordinary natural force. The effect of ordinary natural causes (e.g., that rain will leak through a defective roof) may be foreseen and a...

Economic and Social Council

(Encyclopedia)Economic and Social Council, constituent organ of the United Nations. It was established by the UN Charter and has 54 (18 before 1965) member nations elected for three-year terms (one third every year...

foot, in anatomy

(Encyclopedia)CE5 Foot foot, in anatomy, terminal part of the land vertebrate leg. The term is also applied to any invertebrate appendage used either for locomotion or attachment, e.g., the legs of insects and ...