(Encyclopedia) Perot, H. Ross (Henry Ross Perot), 1930–2019, American business executive and political leader, b. Texarkana, Tex., as Henry Ray Perot, grad. Annapolis, 1953. In 1957 he resigned his…
(Encyclopedia) periodic law, statement of a periodic recurrence of chemical and physical properties of the elements when the elements are arranged in order of increasing atomic number. Such an…
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In 2016, the Academy of Motion Picture Arts and Sciences failed for a second consecutive year to nominate any African-American actors in the major acting categories, prompting director…
acid rain: Rain contaminated with pollutants such as sulfur dioxide and nitrogen oxide. These gases come from fuels being burned at high temperatures and from car exhausts. When acid rain falls, it…
Check out what your favorite American Idols have loaded on their iPods
from iTunes Related Links American Idol Quiz Bestselling Albums by American Idol Alumni…
Lincoln, Abraham (president of U.S.): Shot April 14, 1865, in Washington, DC, by John Wilkes Booth; died April 15.Seward, William H. (secretary of state): Escaped assassination (though injured)…
Fighting FungusFungal InfectionsIntroductionTypes of InfectionFungal Infections of the SkinFighting Fungus As noted earlier in this section, the strength or weakness of the body's immune system is…
IntroductionTuberculosisIntroductionTuberculosis: Airborne NightmareTreating TBTB Is a Global Peril In an age when we believe that we have the tools to conquer most diseases, the ancient scourge of…
