Christmas 2012: The speed bump test

We know that speed bumps have an important public health role, but a Christmas BMJ paper shows they're also clinically useful, and can help diagnose appendicitis. Helen Ashdown, academic clinical fellow in general practice, University of Oxford, and Mike Puttick, consultant surgeon, Stoke Mandeville Hospital, explain. And want to know how many carrots you need to eat to balance out that festive champagne? David Spiegelhalter, Winton professor for the public understanding of risk, University of Cambridge, tells us how to work it out.