Geek or Jock?

Found a fun helmet at a garage sale and all of the sudden he can ride by himself?  Before we were always having to hold on to the back of the seat. 
(Bonus: Now I don't get dirty looks from the neighbors for letting my child ride his bike helmet-less.  :)

One night he just walked over and pulled it out, and perused it a few pages at a time.... Circuit Diagrams already?  Really?