Challenge your mind right now. Come up with a brief, meaningful, and defensible definition of life. Try it. How hard can it be? You know life when you see it, right? You are life. So put that search ...

To successfully look for life beyond our own solar system, astrobiologists desperately need a viable definition of life. Even after a century or so of debate, they lack a viable universal definition ...

As I've said before, "Life is generally valued by those who are living it. Given the choice between life and death, people as a whole want as much life as they can get." In this, I firmly believe. It ...