its a good question, I evaluate it as how much information we collectively have on everything as a whole. It's hard to explain but imagine going back 1000s years and you had google on your phone but no-one else did. You would come across as a very knowledgeable person right? of course it depends on how much you personally can take in but overall you would be a lot more advanced. If that makes any sense?? also today your right, it depends on the field. but overall collectively knowledge is exponentially growing because of some the factors i mentioned! hope that answered your question and thanks for commenting man :)