Freakonomics authors Steven Levitt and Stephen Dubner have written a follow up to their hugely popular bestseller. Their new book, Super Freakonomics, (will the follow up to this be called Super Duper Freakonomics Supreme?) looks at the usual assortment of stuff... eating kangaroo's, pimping, terrorists and selfishness. They also write about what we should worry about. Once again, economics has the answers.