 They don't. And that is one of the things that fascinates me the most about life is that, you know, clearly, this has been an obsession for science for millennia. And yet, to this day, we do not have a precise consensus definition of life. If you open a textbook, you will see long lists of criteria of qualities that supposedly distinguish the animate from the inanimate, but not a precise definition, and certainly not some, you know, fundamental, beautiful equation that explains the phenomenon we call life.