Have you ever wondered what on Earth all of those "best before," "sell by," and "expiration" dates sprinkled on products actually mean?

Go into any grocery store, and you’ll be confronted with different dates on all kinds of food. Not only are there "best before" dates and "sell by" dates, there are also "harvest" dates and "shipping" dates, to name just a few.

If you’re simply trying to buy food that’s as fresh as possible, it’s hard to know what to pay attention to or what dates to trust.

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Ad Council - Save The Food

The Earth has a rhythm. During the summer, plants and algae grow and create oxygen. In the winter, some of the carbon dioxide they've absorbed is released back into the atmosphere.

It's almost as if the Earth were breathing.

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Natural Resources Defense Council