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Purple or brown? This 3D-printed cup changes colour in different light

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A 3D-printed goblet made with gold nanoparticles can look either purple or brown depending on the light, and its colour will never fade
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Bill Gates’s pancake problem – and three more pancakes in science

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Sorting a stack of pancakes by size is a vexing challenge for mathematicians, but Microsoft’s Bill Gates came up with an enduring solution.
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Stephen Hawking’s legacy will be honoured with a new 50p coin

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A new 50p coin will memorialise Stephen Hawking, who died last year, while paying respect to his groundbreaking research on black holes
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