Take classes in philosophy, research methods, literature
Analyze a process or problem
Start a small business
Join clubs and organizations that tackle a project from the ground up
Follow electoral politics: evaluate the candidates, and vote!
Assist a professor with research
Join a book discussion group or debate team
Develop and express a strong "position" in research papers
Seek out people who think differently than you
Write a guest editorial or opinion piece in the school newspaper
Inform yourself about issues: attend public hearings and lectures