In the late 1990s, engineer Dr Caroline Hargrove was working with the McLaren motor racing team when she developed the first Formula 1 simulator – a machine that helps racing teams design faster cars and improve performance. Sixteen-year-old motor racing fan, Marielle from Hong Kong, quizzes Caroline on her work in motor sport, how the simulator works and how drivers came to love it – eventually!Made by BBC World Service and BBC RewindProduced by Tamsin Barber