McDonald’s Burger is 14 Years Old and In Mint Condition — Why Does McDonald’s Food Not Rot?

Hmm…maybe it’s the green slime.  Whatever it is, there are tons of accounts of McDonald’s food, particularly burgers and French fries lasting for years and appearing unblemished by any sort of biological decay.  Should we regard this as a marvelous system of preserving food, or a scary one?  You be the judge.