why???

Our house is filled with 'why' nowadays... why, mommy? why? why? why?
eden has been faithfully asking this question for a little over two years... i'm growing weary, but i just keep answering. i suppose you can imagine i was a little less than thrilled when jada started asking this same, favorite, question a couple months ago. why? why?
it did make me laugh the day that eden yelled at jada for asking why:
"jada, stopping saying why! you say why too much!!!" ....hmmmm... i wonder where she learned it from??
for some reason, this is a very frustrating stage for me. but i love that my kids are curious. i try very, very hard to not answer with the simplest "because" -- i know that's not the answer they are looking for and i know that is not teaching them the things they need and want to learn. but somedays i just want to ask them "why" they keep asking why!!!