You could select one of these seven topics to explore in depth as the focus for your whole project, encouraging each student to make their own investigation related to that topic.
If you want to give students more choice, just select one of these to scaffold a creative enquiry then introduce the 6 other topics and allow them to choose which to pursue. Alternatively they might wish to develop an idea that emerged from the icebreaker activities or from ongoing personal interests.
Each topic includes: