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The Exercise Paradox

Studies of how the human engine burns calories help to explain why physical activity does little to control weight—and how our species acquired some of its most distinctive traits

By Herman Pontzer

Cosmic Inflation Theory Faces Challenges

The latest astrophysical measurements, combined with theoretical problems, cast doubt on the long-cherished inflationary theory of the early cosmos and suggest we need new ideas

By Anna Ijjas, Paul J. Steinhardt and Abraham Loeb

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Listen to Whistle Speak [Audio]

Before cell phones, rural peoples around the world communicated with elaborate languages constructed of whistles.  

By Gary Stix


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