For the last recommendation of the school year, have a look at this quick video clip that shows how sound waves make polystyrene balls appear to defy gravity. It’s a great discussion on sound waves, frequency and standing waves.

The URL: http://www.sciencechannel.com/tv-shows/outrageous-acts-of-science/hi-fi-2/

—

And with that, we conclude the 17th year of The Teacher List! I want to thank everyone who has signed up, sent in recommendations and passed on the recommendations to your friends and colleagues. Have a safe and relaxing summer. We’ll catch up again after Labour Day in September.
-Pete