Two objects unearthed at an archeological site in southern Greece are the oldest wooden tools yet found, according to a paper published on Monday in the Proceedings of the National Academy of Sciences (PNAS). The objects came from the site Marathousa 1, once a lakeshore during the Middle Pleistocene. Other discoveries at the site, including stone tools and animal bones, go back 430,000 years, giving a probable date for the new finds. It is thought that hominins of the Middle Pleistocene used implements made from a wide range of materials. Wood, however, is susceptible to rot unless in an airless environment, making it difficult to find evidence of wooden tools.