Medicine, not that much actually, I think most of the progress we have seen comes from food security and the sanitary movement. With those 2 items, you can bas

Medicine, not that much actually, I think most of the progress we have seen comes from food security and the sanitary movement. With those 2 items, you can basically get to a life expectancy of 70 years in most places, then you add modern medicine, and you go up another 10 years or so.