Well, some of them might have had time for that, but what proportion of society? Point is, the larger the proportion of your society that has access to good education and having their basic needs fulfilled means that they have more time & potential to think & study beyond their immediate horizons. As I said though, there needs to be some "stressors" as I feel/think the best ideas come when you're really pressed and you need to make some breakthrough's, and when you need to survive, but that's not quite the same as the majority of population being "hand to mouth" - I don't think you can have many breakthroughs when you just have a small elite that is not "hand to mouth".