We really seem to know extraordinarily little about how our bodies work apart from physical mechanics & electrical activity. I can't even put a % on the rest except that we have barely scratched the surface. From epigenetics to the brain, metabolism, and immune system, we have a long way to go.
On the other hand, we've probably made more progress in that understanding during the past 100 years than in all of the time before that. So, if our rate of knowledge acquisition is increasing, maybe that upward hill isn't quite so steep.
On the other hand, we've probably made more progress in that understanding during the past 100 years than in all of the time before that. So, if our rate of knowledge acquisition is increasing, maybe that upward hill isn't quite so steep.