5. Sound Waves on Fire
Reuben's tube is a classic way to demonstrate the concept of a standing wave. Pump some flammable gas into one side of a tube, and attach a speaker to the other side, and watch what happens to the columns of flames that issue from small holes along the top.
7. Helium Superfluid
At extremely low temperatures, some liquids stop playing by their usual rules.
See the full article here.
(Via Wired: Wired Science)