We have a parent volunteer in second grade who is fabulous! He is getting is doctorate in biology and loves to teach our kiddos science! First he asked them what they knew about rocks. They said that rocks are made from heat and pressure. Then he asked them what pressure was. They couldn't give him a very good answer, so he demonstrated! He had 12 kids on the table when he did it in my class. This is a picture of him in my friend's class. He kept asking the kids, "Am I a rock yet?" Then he asked them if they could stand there for a couple of hundred years! They really got the concept of PRESSURE!