The fictional Lightsabers are technically laser beams, which have diverse usage at low watts, like scanning UPCs, mapping buildings, remote sensing of the ozone layer or carbon dioxide levels.
Industrial lasers can burn and cut as well but have bulky power supplies, unsuitable for a lightsaber fight.
Food-freezing techniques were one of the more important inventions in culinary history. First, a slower rate of freezing food was used, but it resulted in poor food quality when the food was thawed.
Clarence Frank Birdseye introduced the quick-freezing method in 1924. He noticed a great amount of food spoiling when commercial fishermen tried to sell their fish to the market. This was due to a lack of insulated transportation and stores with inadequate refrigeration options.
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