Jean-Baptiste Michel: The mathematics of history. Keynote Alexis Ohanian at TNW2012. Jane McGonigal: Gaming can make a better world. Richard Baraniuk on open-source learning. Kiran Bir Sethi teaches kids to take charge. Brenda Brathwaite: Gaming for understanding. Sir Ken Robinson: Bring on the learning revolution! Sugata Mitra: The child-driven education. Michael Tilson Thomas: Music and emotion through time.