Last Sunday I was taught how to make a really loud whistle using an acorn cup (thanks Anna :You_Rock_ )
I was going to try to describe how to do it, but then found this link which does the job for me
http://www.sciencetoymaker.org/acorn/assembl.html
It takes a bit of practise to get it right, but when you do you can really annoy your friends
I was going to try to describe how to do it, but then found this link which does the job for me
http://www.sciencetoymaker.org/acorn/assembl.html
It takes a bit of practise to get it right, but when you do you can really annoy your friends