In an earlier article titled What is Life?, I took the reader through a reasoning process to finally arrive at the conclusion that, contrary to general expectation, finding a definition of life is not an overwhelmingly difficult problem at all because life  is a remarkably simple concept – independent spontaneous cooperation.
I think that finding a definition has been seen as difficult because those considering it have confused the definition with the underlying significance of life, which some might call life’s purpose, when the two are almost separate questions.
This confusion, this perception that life is just too hard to explain, has reduced our most inspiring thinkers to the status of mere mortals.

David Chalmers is a philosopher of mind, best known for his argument about the difficulty of what he termed the “hard problem” of consciousness, which he typically discusses by way of a thought experiment featuring zombies who act and talk exactly like humans, and yet have no conscious thought (I explained clearly what I think of that sort of thing in my essay on “The Zombification of Philosophy”).