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Anatomy and
Physiology: It's a Long Way Down

It's a Long Way DownAnatomy and PhysiologyThe Digestive SystemStops Along the WayIt's a Long Way DownJack-of-All-TradesRunning Along the TractPancreatic Panacea?What We Do with Our Food The…

Weather: Thunderstorms

ThunderstormsWeatherThere's No Place Like HomeThunderstormsDoing the TwistThe ChaseStaying Safe in a Storm These powerhouses have their origins in a strong, volatile atmosphere. The atmosphere has…

A Tenth Planet? Or Just Eight?

—By Borgna Brunner In 2003 the dating of an Ethiopian Homo sapiens fossil, “Herto Man,” was hailed as a milestone in paleoanthropology. At 160,000 years old, Herto Man was a full 50,000 years…

Quotes from Famous Native Americans

Sherman Alexie Related Links American Indian Tribes Glossary of American Indian Terms Indian Languages Spoken at Home Facts About American Indians Today American Indian…

Geometry: Isometries

IsometriesGeometryTransformationsIsometriesDilationsSymmetry The word isometry is used to describe the process of moving a geometric object from one place to another without changing its size or…

Sun Tzu on the Art of War: Energy

Tactical Dispositions [1] Weak Points and Strong [1] Energy Sun Tzu said: The control of a large force is the same principle as the control of a few men: it is merely a…

The Prospect/FP Top 100 Public Intellectuals

Who are the world's leading public intellectuals? The October 2005 cover of Prospect Foreign Policy and Britain's Prospect magazine selected their top 100, and invited readers to vote…

The World's 20 Largest Cities by Population

The biggest cities to ever exist For the first time in human history, a majority of people live in urban environments. The world's largest cities today fall under a class that researchers call "…