(0.24) Infant mortality is on the rise in England and Wales – but is this change down to social issues such as obesity and deprivation, as claimed, or the way doctors count very premature babies? (9.45) A self-confessed lazy student wrote in to ask how he can minimise exam revision, while still ensuring a high chance of passing – we do the sums. (15.44) Do a billion birds really die each year by flying into buildings? We explain another zombie statistic which refuses to die. (18.40) It was reported earlier this year that London’s murder rate was higher than New York City’s – but how do the two cities compare now, and is there any value in these snapshot comparisons?