Stone Age people living in Europe 20,000 years ago may have devised a simple form of writing to record the habits of the animals they hunted, according to a study of mysterious symbols on artefacts and cave walls. If confirmed, this would push back the earliest known appearance of a proto-writing system by at least 10,000 years.
At least 400 caves in Europe, such as Lascaux and Chauvet in France and Altamira in Spain, have …