 I'm Lisa Mullins. Professor Stephen Levitzky. Pulitzer Prize winning journalist Nicholas Kristof has witnessed scenes as diverse as the Chinaman Square protests and massacre, the Yemeni civil war, the Darfur genocide, and more. Join us on the next Commonwealth Club Radio program as Kristof introduces some of the extraordinary people he's met and who've inspired him to remain optimistic in the face of terrible tragedies. Hear him on the next Commonwealth Club Radio program.