Something I was told, very luckily I now believe, early in life is that for the most part we are all as smartish as each other, the only real difference is how much attention & time you're willing to pay to a particular thing(s). Yes, it's glib but I continue to believe it holds more truth than many of us would like to believe

Someone (supposedly) published da Vinci's to do list a while back, and from the snippets I read he seemed to spend most of his time talking to experts about subjects he didn't know much about. Pretty telling if true.