> Human derived chemicals and engineering have given us over 40 extra years of life. Yeah well to some degree of participation.. chiefly we have reduced matern

> Human derived chemicals and engineering have given us over 40 extra years of life. Yeah well to some degree of participation.. chiefly we have reduced maternal death rate & early childhood mortality; (re)discovered/refined/improved-upon/better-understood what compounds at what dosage made traditional/herbal/ancient antiseptic/antibiotic/antifungal tinctures actually work and how to turn them into more reliable pharmaceuticals, developed ever better understanding of nourishment and hygiene and surgery, and figured out intravenous saline/nutrient infusions. Those are the major contributors to "moderns' longer lives", and any pre-moderns who managed to circumvent all the above health hazards lived pretty much almost as long as us today (and was greatly revered admired respected and consulted for it by all). "Human derived chemicals and engineering" clearly contributed quite a bit here, no argument. But it's not like some chemists churned out a formula that added 40 additional years to an otherwise-strictly-30-year-lifespan just-like-that.