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Debate: Must 'Plein Air' Be Defined?

Daniel Grant | Posted 05.25.2011 | Arts
Daniel Grant

There are very few rules in art, but artists (like everyone else) want to know that terms are understood in the same way by everyone. Take, for example, the term "plein air."

Amazon Once Held As Many As 20 Million People, Scientists Believe

Washington Post | Juan Forero | Posted 05.25.2011 | Technology

Archaeologists, many of them Americans, say the opposite is true: This patch of forest, and many others across the Amazon, was instead home to an adva...