CDF took some pictures while I was working on replacing part of the dining room floor. While I was nailing, MD came in the room with her toy hammer and asked if it would work well. I let her try, and then she wanted to use a real hammer. It was heavy though, and she gave it back pretty quickly.
The picture below is what the floor looked like after I had cut out a 5 foot by 8 foot section and replaced it with 5/8-inch thick plywood.