Note that some freely downloadable examples can be found [here](http://www.maa.org/publications/periodicals/math-horizons/math-horizons-sample-articles) if anyone wants to see the kind of level these things are pitched at. The latest article, the one about the mathematics of choice, inspired the section on "Exploring the topic" with its section of questions about the topic of the article, but we still have to come up with a good but simple environmental question to supplement the two fully mathematical ones! Any ideas gratefully accepted.