Beloit College releases an amusing list of "Things your freshmen don't know" every year. It's an attempt to keep againg teachers aware of the world that is familiar to students now entering college. This year's list includes items like, "Google has always been a verb." A previous list included, "The phrase 'you sound like a broken record' has no meaning to them."
In ten years, one item on the list will be, "Pluto has never been a planet."