My DS, who is 3.5 years old has started the why phase. Trouble is, I don't know the answers to some of the why questions. For example, some of today's have been:

why is it windy?
why does it rain?
why is today called Sunday?

I can handle most of the questions (not very graciously after a while) but I am at a loss to answer the harder ones.

What did you say to your kids when they asked questions you couldn't answer? I don't want to say "because that's how it is" or something like that but I need something to give him as he gets upset when I can't give him an answer that satisfies him.