So you know how funny it is to suck up helium and then talk funny. Well when I worked in a party store kids loved to do this. So I thought I'd share this video that you might be able to show your kids about why your voice changes. It's pretty funny and very informative... Enjoy http://www.youtube.com/watch?v=d-XbjFn3aqE
I've posted insufficient messages to include a link - sorry - so I'll have to spell it out (unless someone else can kindly post it for me). For high-school students who are really into physics and how things work, I was recently introduced to the following fascinating website - set up by the University of Nottingham in England: After www, type sixtysymbols and then dot com.