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.
Hole or break in retina? The mechanism by which retinal holes are produced is not yet completely understood. The most frequent cause of a hole in the retina appears to be pulling by a shrinking vitreous body at a weak spot in the retina. The vitreous body is a transparent jelly filling the space between the lens and the retina.