Woman's Hour - 03/11/2010

Presented by Jane Garvey. Joan Rivers on her film 'A Piece of Work' . The documentary follows her during her 75th year and is a brutally honest look at the ruthless entertainment industry.The biographer Michael Holroyd talks about his latest work:A Book of Secrets. Professor Janet Mann is one of the worlds leading authorities on dolphin behaviour and she tells Jane about the secret world she's captured on film for the BBC's 'Natural World' series. And the results of the mid term elections in the United States. With many disgruntled with the Obama administration, the threat of the Tea Party candidates to the Republican Party will today's vote be the "political earthquake" within the US some expect? And will this be the Year of the Republican Woman and how will the so-called Mama Grizzlies fare?