Note: This article is a sidebar to this issue’s feature story, “Is It or Isn’t It (Just Another Mouse)?“ When people think about the creatures protected by the Endangered Species Act, they tend to ...

The International Astronomical Union defines a planet as a celestial body that orbits the sun, is massive enough that gravity has forced it into a spherical shape, and has cleared away other objects ...

In 2008, the National Academy of Sciences put forth a textbook-ish definition of "science": "The use of evidence to construct testable explanations and predictions of natural phenomena, as well as the ...

New York, NY — After two decades of fascination, imitation and debate, an international team of longevity scientists says it has reached a formal scientific definition for a “blue zones” region — ...