Fascinating to read about how long and how much tech modern humans and Neanderthals exchanged.
" The new dates suggest that the two species lived in Europe for up to 5,000 years. This backs the view of some archaeologists that relatively late advances in Neanderthal stone tool technologies and their use of jewellery were copied from modern humans."
http://www.bbc.com/news/science-environment-28693371
