Salt, used to preserve food, which meant that it could be stored and traded, was an early aid to distribution.

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If America hadn't gone to war, a man named Birdseye wouldn't have figured out he could preserve food for our troops by flash freezing it in cold water.

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Without the pot, we never would have roamed far from sources of fresh water, and wouldn't be able to preserve food to get through famines and harsh weather.

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Its boffins in Bangalore are working on projects ranging from a red laser to preserve food to a DNA nano-machine to deliver drugs to precisely the right spot in a patient's body.

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Around 9 million U.S. households used ice boxes to preserve their food.

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Frozen-yogurt franchisees were advised to empty, sterilize and unplug all their yogurt machines, and cautioned not to use toxic dry ice to try to preserve any food.

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Clinton's call to significantly toughen the provisions on youth smoking and to preserve the Food and Drug Administration's jurisdiction over tobacco and nicotine was met with enthusiasm from many anti-smoking activists, but coolly in some offices in Congress.

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But taking a radical new approach to food production is not just the preserve of activists.

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But Matthew Rippon, a food researcher at Queen Mary, University of London, warned against seeing PFN as the preserve of small producers.

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