Jean-Jacques Rousseau: as relevant as ever

Theo Hobson: Jean-Jacques Rousseau – part 1: The philosopher's thought still has the power to challenge our deepest assumptions on identity, religion and the Enlightenment

12 Years a Slave: the book behind the film

As Steve McQueen's Oscar favourite 12 Years a Slave opens at cinemas, Sarah Churchwell returns to the 1853 memoir that inspired it – one of many narratives that exposed the brutal truth about slavery, too long ignored or sentimentalised by Hollywood