Researchers are studying artefacts left in prehistoric caves, which may provide insight into the lives of early humans. The artefacts, found in caves such as those in the Pyrenees, include items like bones, hearths, and jewelry, and may indicate cultural exchange between different groups, including Neanderthals and humans. The discovery of these artefacts has also led to findings about ancient symbols, dna preservation, and other historical artifacts, although the time periods and contexts of the finds appear to vary.