There was this story in Science last year about a 90% success rate in cranial surgery by Pre-Columbian Inca physicians. Their sample sizes are low but an observ

There was this story in Science last year about a 90% success rate in cranial surgery by Pre-Columbian Inca physicians. Their sample sizes are low but an observed scaling up of success rates over a 400 year period speaks to institutional mastery beyond what western medicine was able to accomplish until after the discovery of antibiotics. http://www.sciencemag.org/news/2018/06/south-america-s-inca-civilization-was-better-skull-surgery-civil-war-doctors http://www.sciencemag.org/news/2018/06/south-america-s-inca-...