Mr Darcy, the male love interest in Jane Austen’s 19th Century English novel Pride and Prejudice is supposed to be fabulously wealthy on an income of £10,000 a year, but two hundred years later, it’s not clear how rich he really is. As Tim Harford discovers, you need to do more than adjust the amount for inflation. A BBC Trending investigation finds that part of YouTube's system for reporting sexualised comments left on children's videos has not been functioning correctly for more than a year, according to volunteer moderators inside YouTube’s “Trusted Flagger” programme. What can we learn about politics from the power struggles within chimpanzee groups? Professor James Tilley explores the parallels between our political world and that of other primates. (Photo: Colin Firth as Mr Darcy and Jennifer Ehle as Elizabeth Bennet in the BBC adaptation of Jane Austen's Pride and Prejudice 1995)