Thank you all, dear friends!!! I'm a prehistoric archaeologist and from time to time I moved for new excavations. This time I'll go for a neolithic village (4000 a.C. circa) here in Italy, not the third world, Yannis, but not really safe and "civilized"

and Ariel, I think I will find "only" obsidian and flint blades or arrows

All the best
Flavio