A woman, a vegetarian, bought at McDonald's in New York a Happy Meal package lunch - a hamburger and a fried potato. For 180 days, these products were laid on her table without any visible changes - neither mold nor rot the woman who photographed the hamburger every day for 6 months, did not find.
To conduct such an experiment, a curious American was prompted by the story of another woman, who claimed in 2008 that she has kept a hamburger from McDonald's since 1996. Another lady held a hamburger for 4 years and also noted any changes.

Yyy: These are gracious hamburgers.