When you were young, did you associate aluminium with its atomic number (which is 13) instead of baseball bats? If so, the you might want to pass along the keys to the geekdom to your children.
Ken Denmead, editor of Wired magazine’s GeekDad blog and a professional civil engineer, has written a book that includes entertaining and educational science projects for dad to share with their kids. Construct the "Best Slip n' Slide Ever" or build a working lamp with LEGO bricks and CDs. The book has plenty of geeky activities for your little scientists.
$11.56 at Amazon