Life has a standard biological definition, but the moment we explore edge cases—AI, extraterrestrial microbes, immortal beings—the concept stretches beyond chemistry into cognition and identity.
Subject: Evolution.
On Earth, life means metabolism, homeostasis, and reproduction. But push the edges—Mars, machines, immortal minds—and the definition strains. The debate isn’t a weakness in science; it’s a reminder that our definitions carry hidden assumptions. Understanding life requires both biology and philosophy.