FRAGMENT FROM NATURE continues from lat weekend and concludes this weekend on the theme of the evolution of metabolism. As a trained biochemist, I frankly marvel at this tour de force: grappling with, and making sense of the diversity of metabolic pathways that exist is a almost beyond a monumental intellectual exercise, and then to reduce it to a model where you can ask what-if questions requires a level of sophistication that is frankly above my pay grade. When I see it I have deep, deep respect for it. Enjoy.