If you can access BBC iplayer, there is a short documentary about the role played by Hazel Hill, a thirteen year old schoolgirl, in the design of the Hurricane and Spitfire aircraft. She carried out crucial mathematical calculations with her father that helped him convince his superiors that the Hurricanes and Spitfires needed to carry eight machine guns, instead of the proposed four, in order to be able to bring down enemy aircraft.
https://www.bbc.co.uk/iplayer/episod...d-to-win-a-war
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