It's funny - almost as much stuff was knowable, but we couldn't be bothered to get the info. I mentioned in a different thread recently that, today, if you're with a group of friends and someone asks what a platypus eats, someone will whip out their phone and answer in 30 seconds. When I was a teen in that same situation, we for sure could have ridden our bikes to the library to find out, but a question like that just wasn't important enough. If someone suggested going to the library to look it up, we'd laugh at them. There were gobs of things like this that, if no one in the group knew the answer, we'd just shrug and move on.
They eat worms, larvae, shrimp, and crayfish, by the way.