I have three children and they frequently will ask me question that either I never knew, or have long since forgotten. I take these times to demonstrate another lesson -- how to learn.
When I was a child it would end up with a trip to the encyclopedia (we were a Collier's family) and if that did not satisfy our needs, a visit to the library. A few times, we have had to visit the library, generally so my kids can check out a book or two on a specific interest, as the internet/wikipedia/kahn academy now have so much content there are few things an interested mind cannot learn.
I think it is very important for children to learn how to learn and how to admit when you don't know something.
When I was a child it would end up with a trip to the encyclopedia (we were a Collier's family) and if that did not satisfy our needs, a visit to the library. A few times, we have had to visit the library, generally so my kids can check out a book or two on a specific interest, as the internet/wikipedia/kahn academy now have so much content there are few things an interested mind cannot learn.
I think it is very important for children to learn how to learn and how to admit when you don't know something.