How Does Popcorn Pop?

To demonstrate radiation, we did a lab the other day. We microwaved popcorn! Interesting lab, isn't it? How can making popcorn be related to science? Well, as we all know microwaves produce heat. That's why we use it to heat up our food! Anyways, the heat transfers from warmer substances to cooler ones, like the popcorn kernels. When the kernels are heated, the molecules in the water that's in the kernels expand and move around, away from each other. This is kind of like a bunch of people put into a hot room. Because it's so hot, the people are going to move around, away from each other so that they don't get too hot. Now let's say that these people are super strong, like superman, and the room go hotter. What are they going to do? Run around, jump up and down, and hit the walls, over and over again until the room breaks and explodes. Likewise, the molecules in the water of the kernel are expanding and expanding. When there's no more room to expand, the kernels finally pop! Thus, creating wonderful, delicious popcorn. Isn't this very "scientificy-ish" ?