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 — establishing a ...

What is design? What makes it distinct from art, science, or engineering? The editors of this site decide dozens of times a day what is or isn’t “design.” But is it ultimately subjective, or can it be ...

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 ...