Sink or Float?

We decided to try our hand at being scientists.  First, the students had to guess if an object would float in water.  They had to write yes or no on the form with a marker.  Then we tested it out and they wrote what really happened.  They had to write yes or no with a pencil.  Some of them didn't like being wrong and they wanted to change it, but I assured them that it was okay to be wrong when you are doing activities like this.  I try to get them to think like a scientist by making a guess/hypothesis, testing it, make observations and coming up with a conclusion.  They loved this activity!  You can do this sort of thing at home too.