Have you ever bought a bag of bread, and regretted not looking at the expiration date? You probably saw large green mold spores growing on the insides and outside of the slices, rendering it completely inedible, or maybe it had white powdery patches that simply looked unappetizing. How about turned milk? Browned apples? Do you eat bananas that have turned black? Most likely you do not, along with 99% of the food eating public. 

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