Glad to see HS students interested in real SCIENCE................
I’m mostly flabbergasted that the “real” scientists were not able to figure this out. Any kid who has spent a fair bit of time working with sand, water, and gravel at the beach should be able to figure this out, unless they have undergone extensive “training” so as to forget the lessons of childhood.
Good for these kids. ‘Hope they get some of the journal publication credit.