Paul Krugman: Economist and sci-fi buff

From his bully pulpit of his New York Times column, Paul Krugman has been explaining why numbers matters since 1999. The unabashed liberal took the Bush administration to task, but neither has he let the Obama administration off the hook, as his new book, “End this Depression Now” makes clear. The Nobel laureate is in town tomorrow night for a sold-out event sponsored by the Harvard Book Store.