Art critics Waldemar Januszczak and Charlotte Mullins look ahead to important and interesting UK art exhibitions in 2010. Kirsty Lang talks to playwright Frank McGuinness, whose latest play was inspired by Greta Garbo's visit to Ireland in 1967. All this week, Radio 4 has been celebrating moments of genius - flashes of scientific brilliance that changed the way we see the world. Eoin Colfer, author of the latest instalment of The Hitchhiker's Guide to the Galaxy, turns to flight pioneers the Wright brothers for his moment. Peter Biskind, author of Easy Riders, Raging Bulls, about Hollywood in the 1970s, has now turned his attention to the actor Warren Beatty in his new biography, Star. Peter Biskind discusses his tricky relationship with the actor, director and producer, and, inevitably, Beatty's fondness for the opposite sex. This month sees the 20th anniversary of The Simpsons, the long-running animated series created by Matt Groening. To mark the celebrations we hear from one of the show's stars, Dan Castellaneta.