After awhile you get really good at saying "I don't know"! LOL
My DS6 has a notebook that we call "idea trap". Any time he needs an answer that I don't have, we write the question down until we have time to do the research. He's gotten quite good at doing his own research at this point but he loves it if I sit with him while he's looking.

Mom to DS 10, DS 11, DS 13
Ability doesn't make us, Choices do!