Do you remember poor old Corporal Jones in the film 'Dad's Army'? His catchphrase was "Don't panic!" Now two statisticians have written a book, based on research into the things that make us anxious and uptight, which tells us what we should be worrying about. The ratings indicate how dangerous any given occurrence might be, while the Panic Ratings show how much of a threat these things really are, compared with how anxious we feel about them.