> Life is very efficient.
I mean, is it? It's a total tangent, but I've long been having a problem wrapping my mind around the topic of efficiency of life. At whichever scale I look, from ecosystems to inner workings of cells, I see systems held in balance by negative feedback loops, zero-sum games. That is, everything fights everything else for resources, and what we call "balance" is a temporary equilibrium between reproduction, destruction and starvation. Feels like the exact opposite of efficiency. And yet, I can't deny that life can and does a lot with very little. I'm not sure how to reconcile this.
I have this general image in my head wrt. efficiency. Imagine you want to put a box a meter above the ground. There are many ways to do it. You could strap a PLC controller and a rocket engine to it, and keep it up actively. You could put it on a floating platform, filled with hot air, or better, helium or hydrogen. Or, you could just put a mast in the ground and bolt the box to it. The first one is obviously the least efficient, and the last one the most.
When I look at life, I see a lot of things being balanced by means equivalent to the rocket engine approach.