A major part of Wikiversity learning is organized around Learning Projects and Learning Groups. Wikiversity encourages a "learn by doing" model for education. Wikiversity contributors develop learning activities on a wide variety of topics. Wiki technology promotes collaborative editing of "learning projects". Participants are encouraged to learn by exploring topics of interest and editing the wiki pages.
Guernica was inspired by Picasso's horror at the bombing of Guernica, Spain on April 26, 1937 during the Spanish Civil War. What roles do the reactions of artists and journalists play in our perception of war? Can a single painting express more than any single photograph? Participate at the Art and War seminar.
Supernova SN 2006sr, discovered by amateur astronomer Doug Rich in December 2006, is so distant that it has taken 325 million years for the light from this stellar explosion to reach Earth. It is the ninth supernova discovery that he has made.  See the Wikiversity Supernova project.
Public Policy Debate Learn to effectively develop and present public policy positions persuasive to enemies and sovereigns and useful to allies. Attempt to establish appropriate grounds, boundary conditions, usefully specific and general definitions and other attributes useful in a learning community.
Quiz -- learn about using the quiz extension in your pages; discuss the educational use of wiki quizzes; develop pages with quizzes.
Self Paced Reading Labs - A project to develop a set of reading exercises that can be used for self managed reading practice and evaluation.
Strategic Simulations - Help develop strategic level simulations for the purposes of learning and teaching military strategy.
The Science Behind Parkinson's - To build an introduction to the science behind Parkinson's; to follow current research progress; to compile and share the information discovered; to discuss its significance.
"Thoughtful learning," James Roberts. Research-based learning activities customized for specific learning styles. (original link was at Central Kentucky News Journal. This is either gone or is behind a pay wall.)