Hi HKC,
This brought back memories. Our son mucked up our air cond. with tiny pieces of paper, just to see what would happen. He was 3. Later, he put his Legoes in the broiler pan, same reason. At 4, he stuck an unripe berry up his nose, same reason. The ER dr. used forceps. Not pleasant. By the way, dr. said he'd find all kinds of things up kids' noses, even Barbie shoes. We were exhausted, keeping his mind stimulated with all kinds of experiments. There're lots of books on home experiments. The volcano was a favorite. Paper mache, baking soda, and vinegar. Food coloring makes it cool. Very normal, yes.