The Oscar-nominated film Hidden Figures tells the story of African-American women whose maths skills helped put a US astronaut into orbit in the 1960s. But the history of black women working for Nasa goes back much further - and they were still struggling to get the best jobs in the 1970s. In 1943, two years after the US joined World War Two, Miriam Daniel Mann was 36 years old. She had three chil
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