Find out when some of the most historical sites in the U.S. became national landmarks. by Jennie Wood The U.S. began the National Historic Landmark Program to recognize and preserve the…
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(Encyclopedia) Neanderthal manNeanderthal mannēănˈdərthôlˌ, –tôlˌ [key] or Neandertal manNeandertal man–tôlˌ [key], a species of Homo, the genus to which contemporary humans belong, known as H.…
(Encyclopedia) leukemialeukemial&oomacr;kēˈmēə [key], cancerous disorder of the blood-forming tissues (bone marrow, lymphatics, liver, spleen) characterized by excessive production of immature or…
(Encyclopedia) sex, term used to refer both to the two groups distinguished as males and females, and to the anatomical and physiological characteristics associated with maleness and femaleness. Sex…
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(Encyclopedia) vaccination, means of producing immunity against pathogens, such as viruses and bacteria, by the introduction of an killed or weakened microorganism, a harmless piece of a…