Rocksea,
here's a parenting tip for that stage when they are always asking questions.

Almost every "WHY" can be answered with one of the following two words -

Nature

or

Custom

One you explain the terms and give some examples, you can use the short hand to give a basic answer to lots of things, and then see if you child actually wants more, before heading to Wikipedia.

It worked for DS10 around age 3/4.

Smiles,
Trinity

Coaching available, at SchoolSuccessSolutions.com