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Fran Scott discovers the importance of testing an invention. She meets Yusuf Muhammad in his floating workshop on board the HMS President. He introduces her to his invention, ‘Auto Mist’, which automatically puts out fires in the home. He explains the detailed testing procedure he went through, before demonstrating the product in action and getting Fran a little wet in the process.

She also meets Mark Champkins and looks at a ‘Chairpadbag’, one of his range of products designed to help children concentrate at school. He discusses the importance of a trial with real people to find any flaws in the prototype.