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Are humans the only species with enough smarts to craft a language? Most of us believe that we are. Although many animals have their own form of communication, none has the depth or versatility heard in human speech.

Soda and beer. Other than exhaling, bubbly drinks are our closest experience with releasing the greenhouse gas carbon dioxide . So as you confront steamy summer, which cold beverage is best--from an environmental perspective?

A 2008 report may be the closest thing so far to a final word on marijuana's purported health benefits

By Joseph Milton of Nature magazine A key feature of human childbirth, long thought to be unique to Homo sapiens --the arrival of the baby facing backwards relative to its mother--has been observed in our closest living relatives, chimpanzees.

Masters debutants usually turn to their closest friends on the PGA Tour for advice about the daunting Augusta course and India's Arjun Atwal has the ultimate mentor in four-times Masters winner Tiger Woods.

On March 17, after a roundabout, nearly seven-year journey, NASA's MESSENGER probe became the first spacecraft to orbit Mercury , the closest planet to the sun.