The world, on the other hand, has not stayed in one place. Very far from it. In the early seventies there were no personal computers, mobiles, no internet. We had sets of dictionaries in which we would look up words according to the alphabet. If the entry for frog mentioned toad, we would have to look for another book in the encyclopedia to find out about toads.
If we were lucky, tadpoles would be in the same volume. Knowledge was once hard to access. Now it’s easy peasy. Who needs a professor to impart knowledge?