The Energy Tree:  Energy is power, both materially and politically, so we should all be interested in who controls our planet's finite resources. It isn't enough just to find out who is controlling energy supplies and why. Understanding energy issues means we have to understand energy itself.

Making a Steam-Powered Rocket Boat: The heat of the candle will cause the water in the tube to boil. The water will
change to steam and the steam will escape out the hole in the cork pushing the boat forward in the water.