In-Flight Entertainment by Helen Simpson. Vintage, ?7.99  Helen Simpson s fifth short story collection is less about the trials of child care, like her previous volumes, than it is concerned with climate change, which offers a new focus for guilt and generational conflict. She even throws in a sci-fi story set after oil runs out.  More Money Than God   Hedge Funds and The Making Of a New Global Elite by Sebastian Mallaby. Bloomsbury, ?10.99  What do hedge funds do? Can short selling really boil down to making a profit by selling something you don t own? Mallaby s history of hedge funds is largely sympathetic, although he can t stop disquieting elements entering his chronicle. Interesting to learn that alfred Winslow Jones, who invented hedge funds, was a Marxist.  The Bedwetter   Stories Of Courage, Redemption and Pee by Sarah Silverman. Faber, ?8.99  Controversy-courting comedian Sarah Silverman is in memoir-mode here. She was a bedwetter, which only made childhood harder. One of the few Jews in her hometown, she got depression as a teenager, her parents divorced, and a sibling died, all of which she skates over on her way to the next wisecrack.  The Life Of an Unknown Man by andre? Makine. Sceptre, ?8.99  abandoned by his young lover and feeling washed-up, Shutov, a writer, returns to his homeland, Russia, after a long exile in France. In St Petersburg he encounters Volsky, a survivor of the siege of Leningrad and five years in the gulag. Through listening to Volsky s story, Shutov (and perhaps the reader) finds hope.  Colin Waters