- Take an empty soda can.
- Fill it with water and heat.
- Quickly submerge it in icy water -- dry icy water, if available.
- Watch as can instantaneously collapses.
Across the hall, Sienna College students had a couple of neat demonstrations going on. A mysterious-looking contraption dripped bubbles filled with mist that burst spectacularly upon hitting the ground. Inside, we were told, was just a bowl of dry ice and some soapy water.
Next to them, were mixing cream, sugar and flavoring in sandwich bags and placing them on a block of dry ice. Within seconds the frozen treat would congeal, ready to be served with sprinkles.
Some trivia: Did you know that former British Prime Minister Margaret Thatcher was a research chemist who helped develop the first soft ice cream?