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The Tunguska Mystery

Finding a piece of the elusive cosmic body that devastated a Siberian forest a century ago could help save the earth in the centuries to come

By Luca Gasperini, Enrico Bonatti and Giuseppe Longo

What Is a Species?

To this day, scientists struggle with that question. A better definition can influence which animals make the endangered list

By Carl Zimmer

The Neurobiology of Trust

Our inclination to trust a stranger stems in large part from exposure to a small molecule known for an entirely different task: inducing labor

By Paul J. Zak


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