My wife and I homeschool our daughter. We're not afraid to say "I don't know, but let's see if we can learn!" This teaches several things:
a) adults don't know everything, and that's okay
b) not knowing the answer is nothing to be ashamed of
c) you're never too old to ask questions
d) you're never too old to stop learning
I used to teach third grade.
I used to love when a kid asked a question I didn't know the answer. It gave us a chance to try and research it together as a class.
If we couldn't find an answer in a reasonable amount of time I would have the kids take the question home and see if they could get the answers there.
Bonus benefit: it got some parents involved in the class that otherwise would not have :)
One of the best teachers I had was my HS history teacher; there were some times he was asked a question and he would say "I don't know the answer to that but I will research it and find out for you."
It was so much nicer than getting a total BS response.
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