She took a UV-sensitive frisbee and put sunblock on it and then exposed it to the sun. Her tests also established that this frisbee is ridiculously sensitive to UV. It turns full color on a sunny day in 1 minute. It even turns full color on a rainy day under light rain conditions, though it takes three minutes for that. That was part of the Mom aspect. I encouraged her to talk about its limitations as part of her writeup. She couldn't see why she should. I explained that no one has ever seen this frisbee before and it needs explanation. Weatherdude picked it up at a kick-off of the EPA's "Don't Fry" campaign. (No, I'm not making that up. http://www.epa.gov/sunwise.) Miss E did her own testing, didn't use the website for ideas. The parenting part of this was teaching her exactly what is involved in data collection and analysis when it's 'new' data. Not to mention writing down your observations so you can refer to your own notes instead of relying on your memory. (I do that too.)
And while Miss E is not a fan of black, she was the one who determined that it would make her project stand out in high contrast. Not to mention that no one else she knew of had thought of using black.
We're still working on organization and deadlines, in the sense of being her responsibility, not Mom's. Like I should talk. I was the queen of incompletes, even in college. Which, again, is why there's so much irony in my pushing her to make the deadlines and chop the project into doable steps.