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Fred Rickaby from North Carolina asks: "When we are preparing a cup of tea and the cup contains nothing but hot, brewed tea we need to add milk and sugar. My wife always adds the sugar first, stirs the cup to make sure it is dissolved and then add the milk. So, is that an optimum strategy for adding milk and sugar to a cup of tea?" In 'The Curious Cases of Rutherford & Fry', Adam Rutherford asks chemist Prof Andrea Sella to provide the answer. Plus Hannah Fry puts Master Tea Taster Alex Probyn to the test. Send in your everyday mysteries for the team to solve by emailing: curiouscases@bbc.co.uk Image copyright: Christopher Furlong/Getty Images
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