The following timeline lists terrorist attacks against the United States and Americans living either in the U.S. or abroad. 1920 Sept. 16, New York City: TNT bomb planted in unattended horse-…
(Encyclopedia) heroinheroinhĕˈrəwən [key], opiate drug synthesized from morphine (see narcotic). Originally produced in 1874, it was thought to be not only nonaddictive but useful as a cure for…
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Atmosphere
atmosphere [Gr.,=sphere of air], the mixture of gases surrounding a celestial body with sufficient gravity to maintain it. Although some details about the…
(Encyclopedia) metal, chemical element displaying certain properties by which it is normally distinguished from a nonmetal, notably its metallic luster, the capacity to lose electrons and form a…
U.S. Department of State Background Note Index: History Economy Foreign Relations U.S. Relations HISTORYThe present constitution--which dates from 1848 and has been amended several times, most…
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MissouriMissourimĭz&oobreve;rˈē, –ə [key], one of the midwestern states of the United States. It is bordered by Illinois, Kentucky, and Tennessee, across the Mississippi…
(Encyclopedia) nucleus, in physics, the extremely dense central core of an atom.
Following the discovery of radioactivity by A. H. Becquerel in 1896, Ernest Rutherford identified two types of…
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element, in chemistry, a substance that cannot be decomposed into simpler substances by chemical means. A substance such as a compound can be decomposed into its constituent…
