Mick Jagger went to the London School of Economics before he went into singing and songwriting… 
Feynman lays out his safecraking very simply in his autobiography. Most safes were like the old high school locker combination locks -concentric tabs on the inside, so you turned all the way 2 times to the first number, back around once to the second, then directly the other way to the third. IIRc there were 30 numbers, and most locking filing cabinets would sit there open.
They either stuck on the last number, or people neglected to spin the dial after opening; so there was one number right away. he would lean against the drawer talking and appear to just be fiddling with the knob; but as the other post says, he figured once you found the last, you could set thefirst number, and just try midle-last combinations; 30 or 50 or whatever. The tolerance was such you only needed to do every other number .
So he had something like 15^2 or 25^2 combinations to try in sequence - a decent number but not impossible. He’d make notes when he got back to the office, and pick up where he left off next time he was in that office. Eventually he had a list of everyone’s combinations.
I suppose his gift was that he could talk and do other things while fiddling with the lock. When the big shot left abruptly and told no one the safe combination, they had to call a local locksmith who “knew how to crack safes”. After the guy need a bit of privacy to do the crakcing, Feynman asked how he did it. The guy said - “Oh, the safe was still on the default factory combination. I just had to waste a half an hour to make my fee seem reasonable.”
Most people old enough will remember Feynman as the guy who investigated the Challenger failure; during a news conference he put some O-ring material in a clamp in ice water. when he took it out and unclamped it, it did not bounce back; thus demonstrating how poor the seal on the solid booter segments could be.
I agree; a smart guy in the 1600s or so could be a “learned man”. There was a lot less to learn, and a lot less competition. Yes, really smart guys like Leonardo could go places despite their original lwo station in life, but even decently smart people were more likely to end up where they started, at the bottom of the social ladder without education. A smart pig-farmer probably just gets beat up by the other pig farmers, especially if he corrects their ukrainian or swahili.
Da Vinci too is best known for starting a lot of things and never finishing, and having great ideas that never really worked - like flying machines. They had to nag him to finish the Last Supper over a couple of years or more; and he did it directly on the concrete wall, so the moisture seeping in ruining it within decades.
I like to think of da Vinci as lucky enough to be very smart at the right place and time - like the guys who wrote Microsoft Basic or Visicalc or Linux when it was possible to write a million-“selling” program without a huge army of coders; or the Wright brothers, who showed that what little physicists thought they knew about aerodynamics of wings was wrong; or Edison, or Newton, or Einstein who could turn physics around 180 degrees working with a pad of paper in his desk between bits real work.