Crikey! ... oh, wait, Aussies don't really say that...

So this is just too cool not to post, despite it being off topic. Researchers from Australia have applied acoustic physics to understand how didgeridoos make those crazy sounds [LINK]. Apparently it's all about changing the position of the glottis (part of the windpipe), enhancing certain frequencies and getting a different resonance inside the didgeridoo. So neat!