I learned that to a 4 year old "Ankles" and "Knuckles" are very similar, and honestly they look a lot alike. My 4 yr old came to me with his pants on and asked, "Are my knuckles showing?"
I learned that if you leave the window open on a breezy day you will most likely have to dust. ALOT.
I also learned if you use a wet sponge to clean it up you make mud.
I learned that you might think that recycling a container into a tool box is a great idea until your neighbors ask to borrow a tool. Then it looks more hillbilly than hippie.