Leftovers are the uneaten edible remains of a hot or cold meal after the meal is over and everyone has finished eating. Food scraps that are not considered edible (such as bones or the skins of some vegetables and fruits) are not regarded as leftovers, but rather as waste material. In order for something to appropriately be classified as "leftovers", it must constitute a meal by itself, and therefore should not be limited to just portions of the original (side-dishes, garnishments, etc.). The ultimate fate of leftovers depends on where the meal was eaten, the preferences of the diner, and the prevailing social culture. Home cooking leftovers are often saved to be eaten later. This is facilitated by being in a private environment, with food-preserving facilities such as airtight containers and refrigeration close at hand. Some leftover food can be eaten cold from the refrigerator, while others may be reheated in a microwave or a conventional oven, or mixed with additional ingredients and recooked to make a new dish, such as bubble and squeak. Though leftover or partially eaten food (Ucchishta) is never offered to a Hindu deity, the goddess Matangi is prescribed to be offered this taboo oblation to gain her grace to achieve Supreme knowledge and supernatural powers. The word "ort", meaning a small scrap of food left after a meal is completed, is not commonly heard in conversation, but is frequently encountered in crossword puzzles.