As we approach the second anniversary of the devastating Haiti earthquake, which killed around 150,000 people and destroyed much of Port-au-Prince, there has been mixed progress. About half of the rubble has been cleared (if that sounds slow, consider it took five years to remove far less rubble in Aceh after the 2004 Indian Ocean tsunami). About half a million people are still living in camps in Haiti -- but that is down from closer to 1.5 million two years ago. Meanwhile cholera, introduced by U.N.