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Lowest Life Expectancy, 2013

The countries with the lowest life expectancy (in years). 1. Chad 49.07 2. South Africa 49.48 3. Guinea-Bissau 49.50…

What Poisons Kill the Most People Today?

By Logan Chamberlain Poisons, per the Center for Disease Control, are the leading cause of injury death (sudden death not by disease or deprivation) in the United States. Although everyone has a…

Complete Idiot's Guide to Geometry

Geometry Geometry   ch01s01 taking-burden-out-proofs   ch01s02 law-detachment ch01s03 importance-being-direct ch01s04 proof-by-contradiction-advantage-being-indirect ch01s05 given-…

Writing Skills

    Subjects » Geography » History » Language Arts » Mathematics » Science » Social Studies Skills Writing Finding the Best Essay…

Astronomical Terms

  The Milky Way, the galaxy containing our solar system, is about 100,000 light-years in diameter and about 10,000 light-years thick.   Aphelion: see Orbit. Apogee: see Orbit. Black hole…

infertility

(Encyclopedia) infertility, inability to conceive or carry a child to delivery. The term is usually limited to situations where the couple has had intercourse regularly for one year without using…

mass extinction

(Encyclopedia) mass extinction, the extinction of a large percentage of the earth's species, opening ecological niches for other species to fill. There have been at least ten such events. The five…