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Fresh fruit

Most fruit and vegetables sold in supermarkets come with a label saying 鈥渨ash before eating鈥�. What are the risks of eating unwashed produce and does a quick sluice under the tap reduce them significantly?

Ian Cairns, Seaford, East Sussex, UK

End of an era

Dinosaurs went extinct 66 million years ago, apparently as a result of an asteroid impact. How much time elapsed between that event and the death of the very last dinosaur?

Sami Franssila, Helsinki, Finland

听

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