By adopting a sedentary way of life, the Neolithic groups increased their awareness of territoriality. During the 9600-6900 BCE period in the Near East, there were also innovations in arrowheads, yet no important changes in the animals hunted was detected.
3. Poor screen preparation is a major cause of pinholes. Particles of dirt, wood frame chips, and dust remaining on the fabric during coating will be trapped in the emulsion. Opaque, they will block light from hardening the emulsion beneath them, so that the emulsion in these small areas will wash away after exposure.
The nail thickens, and the skin becomes cracked where the nail pushes into it. At times the curve can get so severe, the side edges of the nails will almost touch, causing significant pain. Left untreated, infection can develop. A number of factors can cause pincer nails to evolve. Genetics can play a role, since the natural shape of the nail plate determines how a nail grows.