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Before refrigerators and freezers were invented, people cooled their food and kept them from spoiling by putting it in ice and snow. This was obvious not convenient and does not nearly have the same power as a mechanic refrigerator/ freezer does. In this experiment students will find out whether freezing or refrigerating destroys more bacteria. This is essential to consuming safe and germ-free food.
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Fecha publicaci?n: 12.5.2016
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