When it comes to natural disasters, Haiti seems to have a bull's-eye on it. That's because of a killer combination of geography, poverty, social problems, slipshod building standards and bad luck, experts say. The list of catastrophes is mind-numbing: This week's devastating earthquake. Four tropical storms or hurricanes that killed about 800 people in 2008. Killer storms in 2005 and 2004. Floods in 2007, 2006, 2003 (twice) and 2002. And that's just the 21st Century run-down. "If you want to put the worst case scenario together in the Western hemisphere (for disasters), it's Haiti," said Richard Olson, a professor at...