Hello. My sister is going to participating in the science fair, and apparently my mom would like me to get a great concept for her to use (she wants to go to an elite university and she needs this on the resume). It is only for 9th graders, so I figure that PF can think of better ideas than any of them can. I already suggested supercooling water and doing the instant-freeze trick (I tried it yesterday, its real cool to watch), but I couldn't think of applications for that. Any ideas? There aren't many things that we are not willing to do with this as long as the materials are not illegal or crazy expensive.