We talked about the "cheese" factor. And by "we" I mean "me". Apparently, that was not enough, because about 1/3 of the samples I got back were still "edible and fermented". Next year more "we" and less "me". (hah! as if!)
I made sure to share the wealth and divide the types of problems "evenly" by birthday.I made sure to get them to talk to someone who is NOT from calculus about the problem and ask if it was something that looked like someone would care if it was solved.