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How one apple can ripen the fruit around it

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One bad apple does, in fact, spoil the whole bunch, and it does so via chemical warfare. Apples continuously exhale ethylene gas, a natural plant hormone that triggers cellular breakdown and sweetening in surrounding fruits. If you trap a banana in a paper bag with an apple, the banana will practically liquefy from the aggressive ripening fumes.

How one apple can ripen the fruit around it
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