I attended a screening of the film Third Harmony in December and was moved to tears. Check out the book, host a film screening, watch the trailer: and then rent for $6.99 for individual home use. There's also a cool board game.
Read the Book
The Third Harmony: Nonviolence and the New Story of Human Nature is available from Berrett-Koehler publishers. This is an essential read to accompany the documentary. Order your book here.