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Better than expiry dates, our sense of smell can often be relied upon to check whether foods are still edible. Indeed, more and more voices are being raised to promote the use of this sense as a tool for checking the freshness of food. Meanwhile, in the United Kingdom, a student has developed a hand-held smell sensor that detects the freshness level of fruit. In the UK, the fight against food waste is regularly in the news, with headlines calling out the expiry date system as one of its driving forces. Indeed, an estimated 6.6 million tonnes of food are thrown away each year by British househo…

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