Brilliant low cost way of demonstrating Sound Waves

This is an easy, entertaining and very engaging way of explaining sound waves, using straws. The straws have been joined together and then twisted. This was used to demonstrate the crest and trough of the wave, and then the frequency. This workshop was conducted by Ashop Rupner, he has conducted these 'activity' workshops for the past 15 years. He makes over 200 different inexpensive science toys. Website details to follow. www.arvindguptatoys.com