Mr. Wizard was around when I was a kid, but somehow I stumbled upon a little-known program called
"Newton's Apple". That really helped spark my interest (sometimes literally!) in all things scientific.
Of course, it didn't amuse my mom when I asked, as I was getting out of the car for school, "If an atom is the smallest thing in the world, how do you split it?" Her reply: "Well, you take this little tiny hammer, and this little tiny chisel, and I'll explain the rest when you get home." Probably a good answer for a 7-year-old!
(Note: she did explain the real answer when I got home.)
WW