I had actually completely forgoten about this obsession until you mentioned it. Yes, kindergarten through second grade I was obsessed with coins. I have my penny book filled out from 1900- 2005. Even the steelies! I am close on the nickels. Have all dimes 1900-2005. And all quarters 1965- 2005. And to be specific, I do not have all of the various "s" "d" and "p" designations for the nickels, dmes and quarters but I do for the pennies. I also have a $20 replacement note, various old coins (pre- 1900), foreign coins and other paper money. Before today, I haden't looked at my collection for years. Thanks for mentioning it!
I also used to collect rocks during the same time period. I actually found a huge stash of petrified wood near my house. My largest piece was about the thickness of a small log and two feet long! Unfortunately, a lot of the collection has been grown over by shrubbery, I will have to uncover after finals are over.