It seems like that should be the case yet when I listen to any same group of people over a period of time, I often find that those unfamiliar with a concept or solution on day 1 end up repeating it as if it was their own a few weeks later. When I was younger I tended to assume there was an element of intentional theft, but I'm not sure it's natural and a prerequisite to educational acquisition that people can categorize original origin of ideas that may have bounced around them for a long time before they understood their significance.