Refrigerated and frozen food is supposed to remain that way during transport to the market. Often, this doesn’t occur, increasing the risk of food poisoning. Now, scientists have developed nanoparticles that can tell whether and how long a food has been exposed to inappropriately high temperature.

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Refrigerated and frozen food is supposed to remain that way during transport to the market. Often, this doesn’t occur, increasing the risk of food poisoning. Now, scientists have developed nanoparticles that can tell whether and how long a food has been exposed to inappropriately high temperature.