The correspondence of Dorothy Hodgkin (1910-1994) introduced by her biographer, Georgina Ferry. Later in life, Dorothy combined scientific research with actively campaigning for peace, travelling to China and Russia during the Cold War and later writing to her former student, Margaret Thatcher. On receiving the Nobel Prize for Chemistry in 1964, she said she hoped that, in future, a woman winning such a prize would not require any special comment as 'more use is made of the talents that women share equally with men'. Fifty years later her hope has still not been fulfilled. Dorothy Hodgkin remains the only British woman to have been awarded a Nobel Prize for science. Producer: Anna Buckley.