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The glasses in the video are also on inverted plastic bins. This might be providing some shock absorption. From my experience of breaking glass with sound, there is a huge variation in the robustness of glasses. If you haven't already, I would go around a department store looking for the thickest well-made glasses. Of course, it would be possible to cheat and weaken the broomstick. If it has a fault in the middle, that would give it a fracture point for a crack to open up and break it. So it is also be down to the type of broomstick. Poor quality ones made from poor quality wood might break the best and without cheating! You might also look at how you hit the broomstick. But you'd have to talk to a karate expert about that If you get this to work, I'm borrowing a high speed camera in June, it might be fun to film it being done on that. Trevor -- Trevor Cox Professor of Acoustic Engineering EPSRC Senior Media Fellow Newton Building, University of Salford, Salford M5 4WT, UK. Tel +44 161 295 5474 Mobile: 07986 557419 www.acoustics.salford.ac.uk ********************************************************************** 1. To suspend yourself from the list, whilst on leave, for example, send an email to mailto:[log in to unmask] with the following message: set psci-com nomail -- [include hyphens] 2. To resume email from the list, send an email to [log in to unmask] with the message: set psci-com mail -- [include hyphens] 3. To leave psci-com, send an email to [log in to unmask] with the message: leave psci-com -- [include hyphens] 4. Further information about the psci-com discussion list, including list archive, can be found at the list web site: http://www.jiscmail.ac.uk/lists/psci-com.html 5. The psci-com gateway to internet resources on science communication and science and society can be found at http://psci-com.ac.uk 6. To contact the Psci-com list owner, please send an email to mailto:[log in to unmask] **********************************************************************