“For a long time, I’ve been aware of some fundamental mysteries around energy. First of all, the basic question: what is energy? This is a big topic itself. But in the context of livingsystems, the problem or the challenge is to really understand energy as it pertains to organisms; this is known asbio-energetics. The question here involves not only the issue of the nature of energy but understanding preciselyhow living systems engage with energy; how they’re powered so to speak. This is a central feature of the mysteryof life itself, and it is far from well understood.”