This is primarily a high school and college resource, although it could perhaps be modified to lower age levels. When I taught AP Environmental Science, I used these case studies quite a bit.
I have had mixed results with middle school doing anything similar. They need a lot of modification. However, as I transition back to high school, I plan to try to use these more. I think the roll-out of Common Core, and increased non-fiction reading is a perfect place and reason to use case studies. It forces students to read and comprehend non-fiction, and could be a great jumping off point to build in more current events and news articles from around the world (which is one of my goals for next year).
There are a couple of cases designed for middle school, others for general/information education, and the cases are searchable in many ways.
Each year they have a fall conference to learn about teaching with case studies. I have wanted to attend, but never have. This year, there is a special piece of that conference for high school teachers, and a scholarship for high school teachers.
Wish me luck, and definitely check out the website for your own classroom use, or just for ideas.
A modification of a case, along with the supporting lesson plan materials that I created when I was student teaching are still posted here
I used this case as a jumping off point for sock mitosis (picture is students doing the same activity, but not my students, from http://www.rpi.edu/dept/eng/otherweb/GK12/indexca2b.html)
I have used this lesson since then with high school kids (good results) and middle school kids (pretty good results)...they didn't get all about mitosis, but they definitely got the larger picture and remember, still, that errors during the egg formation can cause Down's Syndrome. Guess they learned something!