image: Excavations inside the Blätterhöhle cave are impaired by its very narrow structure. This image relates to a paper that appeared in the 10 Oct., 2013, issue of Science Express, published by AAAS. The paper, by Ruth Bollongino at Johannes Gutenberg University of Mainz in Mainz, Germany, and colleagues was titled, "2000 Years of Parallel Societies in Stone Age Central Europe." view more
Credit: [Image courtesy of H. Wippermann]