The history of Sweden can be traced back to the melting of the Northern Polar Ice Caps. From as early as 12000 BC, humans have inhabited this area. Throughout the Stone Age, between 8000 BC and 6000 BC, early inhabitants used stone-crafting methods to make tools and weapons for hunting, gathering and fishing as means of survival. Written sources about Sweden before AD 1000 are rare and short, usually written by outsiders. It was not until the 14th century that longer historical texts were produced in Sweden. It is therefore usually accepted that Swedish recorded history, in contrast with pre-history, starts around the 11th century, when sources are common enough that they can be contrasted with each other.