Without becoming too critical or cynical, maybe consider, with your children sometimes, changes in knowledge (the platypus, Mars, Pluto, leeches, volcanic activity and virgin sacrifice compared to global warming's medicine men; anything smaller than an atom?), or geography ("Four Corners" has been in the wrong place all these years; the U.S.S.R. is still on maps in some public places) or spellings ("plough" or "plow"? wooly or woolly?).
Play lightly with these ideas. There's no advantage to getting huffy or angry about it. Just see it as the reality it is. People learn. People change their minds. Knowledge grows. Evidence is reclassified. Language is alive. People who are alive are changing and learning. You can resist that or you can ride it with gusto.
Fact/Fallacy/Opinion
photo by Sarah S.