Kirsty Young's castaway is the engineer and nuclear scientist Dr Dame Sue Ion.
The first woman to be awarded the highly prestigious President's Medal by the Royal Academy of Engineering, she has worked her way to the heart of an industry that remains very contentious.
Her passion for understanding how and why the world works the way it does first began as she tinkered for hours at her parents' kitchen table with a little chemistry set.
Today she goes into schools to encourage more girls to take up engineering and her enthusiasm for the subject has galvanised many to take up the discipline.
Producer: Paula McGinley.
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