I was a student once too. However, you can examine your change. If you see dimes/coins dated before 1965 put them in your piggy bank.<<<
Good answer!.in fact...it’s a Law.....
http://en.wikipedia.org/wiki/Gresham’s_law
Thanks for the link. It was an interesting read. Pennies, nickels, and any pre-1965 coin is good to hang onto. That’s easy enough to remember.