Really, though, it's no surprise the meal didn't rot. Tons of home experiments have shown that fast food meals tend to keep their appearance over time. This could be due to artificial ingredients in the food, such as preservatives, or it could be that the shape of burgers and nuggets makes them dry out quickly and therefore avoid molding, as Serious Eats hypothesized in 2010.
"Decomposition of food happens under certain conditions," McDonald's spokesperson Lisa McComb told HuffPost Wednesday. "Any food -- whether homemade, store bought or from a restaurant -- can dehydrate in a dry environment, [and] therefore not decompose."