Excuse me while I get a little emotional. Today is Rowan's last day of his first year of preschool. I can hardly believe that a whole school year has gone by already. I just registered him for summer camp, the pool opens this weekend, and I packed his lunch and carried his backpack for the last time this morning.

It's hard to describe the leaps and bounds that Rowan has made over the last year, and how, without a doubt, preschool has played such an integral part in his growth. His teachers hav...