As cars were banned from central Paris this weekend and the health risks of pollution hit the headlines, Mark Porter examines the statistic that pollution kills 29,000 people a year in the UK.

And he visits a pioneering clinic at Southampton General Hospital where falls in the elderly are seen as a risk factor for underlying health problems; 'Having a hip fracture is like having a heart attack or stroke' explains Dr Mark Baxter. 50% of people who have a hip fracture will have previously presented with a fall, but once they go on to break a hip, 1 in 10 elderly people may not be alive at the end of the month and up to 25% by the end of the year. Many elderly people are found to be on multiple treatments - blood pressure pills or bladder pills for example - that make people fall over. In recent years there has been much more attention paid to the cumulative burden of the side effects of medicines in the elderly - particularly the group of commonly used drugs known as Anticholinergics. And according to new research by a team at the University of East Anglia, taking Anticholinergics increases the risk of falls too - particularly in men.

Following news of the Meningitis B vaccine in children, an Inside Health listener got in touch to ask why it wasn't being given to teenagers in light of data showing that there is a second peak in incidence in the disease among 15 - 19 year olds? Mark talks to Professor Andrew Pollard, Chair of the Joint Committee on Vaccination and Immunisation.

And Inside Language: Dr Margaret McCartney and Professor Carl Heneghan demystify the terminology of medicine and research. This week, false positives and false negatives; when is something not what it seems, and when does it seem what it's not?