Why does lettuce stored in a bag stay fresh longer?

Jul 30, 2014 · 2 min · 2.3 MB

0:00-2:22

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Many foods you'll find at the grocery store -- like lettuce, for example -- are stored in special plastic packaging called MAP that helps them stay fresh longer. Find out what MAP is, and how it keeps food fresh longer, in this episode of BrainStuff.

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