Then I went to help out with pumpkin experiments in Isaac's class. I got the "does our pumpkin sink or float" station, which was an awesome station to have. First of all, pumpkins float. (I had been debating it in my head so the first one was a surprise to me too.) Secondly, kids love finding out if things sink or float. The second group I had had their stem fall off, so we put that in the water too. That started putting lots of things in the water. We may not have talked as much about density and instead just put stuff in the bucket of water, but it sure was fun.
When the third group got to me, they had cut open their pumpkins and taken out the insides. So what did we do? We filled the pumpkin with water! Small pumpkins still float and the large pumpkin did not. As they got filled with water you could see that they floated lower in the water.
Only a few people got their sleeves wet. I cleaned up after myself, including the bucket of water and pumpkin guts.