How to Reduce Exam Revision with Maths, Infant Mortality, London's Murder Rate

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It was recently reported that the infant mortality rate in England and Wales has risen - bucking decades of constant decline. Some of the causes cited in the news include social issues such as rising obesity in mothers, deprivation and struggling NHS staff. We hear from a paediatric intensive care specialist and a health data researcher who say the rise is more likely because we're counting the deaths of very premature babies differently to in the past. HOW TO REDUCE EXAM REVISION WITH MATHS A self-confessed lazy student has asked for help with his exams - what's the minimum amount of revision he needs to do in order to pass? Rob Eastaway from Maths Inspiration does the sums. A BILLION DEAD BIRDS? It's claimed that a billion birds in America die each year by flying into buildings. Where does this number come from and how was it calculated - and is it remotely correct? LONDON v NEW YORK CITY It was reported earlier this year that London's murder rate was higher than New York City's for the first time - but how do the two cities compare a few months down the line, and is there any value in making these snapshot comparisons? Presenter: Tim Harford Producer: Richard Fenton-Smith Editor: Richard Vadon.