Types of cheese cheeses—grating cheeses such as Grana Padano, Parmesan or Pecorino—are quite firmly packed into large forms and aged for months or years. Some cheeses are categorized by the source of the milk used to produce them or by the added fat content of the milk from which they are produced. While most of the world's commercially available cheese is made from cow's milk, many parts of the world also produce cheese from goats and sheep. Examples include Roquefort (produced in France) and Pecorino (produced in Italy) from ewe's milk. One farm in Sweden also produces cheese from moose's milk. Sometimes cheeses
The Moon is made of green cheese of this trope, and the assumption of their own naivete, to hide their smuggling activities from government officials. A 1902 survey of childlore by psychologist G. Stanley Hall in the United States found that though most young children were unsure of the Moon's composition, that it was made of cheese was the single most common explanation: Before that time, and since, the idea of the Moon actually being made of cheese has appeared as a humorous conceit in much of children's popular culture with astronomical themes (cf. the Man in the Moon), and in adult references to it. The Moon