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.
Any drill hole up to 20% of the diameter of the bone weakens the bone by 40% of its original strength. Ninety percent of fractures around fracture fixation implants occur through a drill hole (see image below). Failed fixation caused by fracture through screw holes.