Cool Topic, but Dry

Or, "Why Teaching High School Science is So Much Fun."

We'd used dry ice in the morning for the Advanced Physics lab, as they measured the speed of sound through air and through the CO2 gas sublimed from the dry ice.

(Top photo by Koffi Toulaboe)

In the afternoon, the freshmen got to play investigate some properties of this substance that so easily changes from solid to gas. Students were surprised that the gas wasn't wet, like water vapor is. (Dry ice, remember?)

*This* is what makes teaching so exciting - seizing that moment. Those moments produce more learning and more excitement about science than even the prettiest PowerPoints.