We have found that the best time to teach the kids a lesson is when Dad doesn't believe it.  Over lunch one day Mom and Dad and Alizona were talking about gravity, and why things are heavier on the earth than they are on the moon.  This led to a discussion about the classic experiment that is attributed to Galileo (but he probably didn't do it), in which two similar objects of differing weights dropped from the same height both hit the ground at the same time. Dad said, "Wait.  You mean to tell me that if I drop a bowling ball and a marble from the roof, they will both hit the ground together?" He looked doubtful. Alizona insisted, "Yes, they will!" So Dad and Alie did some experiments, and she gave the scientific explanations for the results. We made a believer out of Dad, and a teacher out of Alison.  See?  Homeschooling IS for everybody.