Yes. Another one!
As always - I am incredibly grateful to sk and to Ms. Artisan. In this particular case - I also owe a big shout out to Meredith - who not only offered some brainstorming, but even went and found the links to help me sort out the science - or the Eureka 'science' for the kids science fair project.
Posted at my AO3 page -
http://archiveofourown.org/users/Nell65