You hear the story every year around this time: Turks massacred hundreds of thousands of Armenians in the early 1900s. The modern state of Turkey claims that the crumbling Ottoman state did not premeditate or direct the killings, noting that the Turks suffered as many deaths as the Armenians. Armenians, for their part, want the episode recognized as genocide, and they blame the international community for its inattention and hypocrisy. It sounds like one of those debates that will go on for eternity.

“Extreme poverty can be ended, not in the time of our grandchildren, but our time,” wrote Jeffrey Sachs, director of Columbia’s Earth Institute and Special Adviser to Kofi Annan on the Millennium Development Goals, in his new book, The End of Poverty.