The Freakquel is here. In their new international bestseller, Superfreakonomics, Steven Levitt and Stephen Dubner look deeper, question harder and uncover even more hidden truths about our world, from terrorism to shark attacks, cable TV to hurricanes. They ask, among other things:

• What's a sure-fire way to catch a terrorist?
• Are people hard-wired for altruism or selfishness?
• Which cancer does chemotherapy work best for?
• Why is combating global warming easier than we think?

Sometimes, the most superfreaky solution is the simplest.