, ▁due ▁to ▁the ▁absence ▁of ▁c ere bro sp inal ▁fluid ▁in ▁the ▁sub ar ach no id ▁space , ▁the ▁a rach no id ▁mater ▁falls ▁away ▁from ▁the ▁dur a ▁mater . ▁It ▁may ▁also ▁be ▁the ▁site ▁of ▁tra uma , ▁such ▁as ▁a ▁sub d ural ▁h emat oma , ▁causing ▁ab normal ▁separation ▁of ▁dur a ▁and ▁a rach no id ▁mater . ▁Hence , ▁the ▁sub d ural ▁space ▁is ▁referred ▁to ▁as ▁" pot ential " ▁or ▁" art ific ial " ▁space . ▁ ▁See ▁also ▁ ▁E pid ural ▁space ▁ ▁Sub ar ach no id ▁space ▁ ▁Men ing es ▁ ▁Sub d ural ▁h emat oma ▁ ▁References ▁ ▁External ▁links ▁▁▁▁▁ ▁Category : M ening es <0x0A> </s> ▁Br uster ' s ▁Ice ▁C ream ▁is ▁an ▁American ▁chain ▁of ▁ice ▁cre am ▁parl ors ▁whose ▁ice ▁cre am ▁and ▁fro zen ▁y og urt ▁is ▁made ▁from ▁a ▁milk - based ▁mix ▁at ▁each ▁individual ▁store . ▁ ▁Their ▁primary ▁operating ▁region ▁is ▁in ▁most ▁states ▁east ▁of ▁the ▁Mississippi ▁River . ▁The ▁chain ▁is ▁based ▁in ▁the ▁Pitts burgh ▁sub urb ▁of ▁Bridge water , ▁Pennsylvania . ▁All ▁of ▁the ▁ice ▁cre am ▁is ▁made ▁fresh ▁in ▁the ▁stores ▁in ▁order ▁to ▁avoid ▁ice ▁cry stal ▁formation . ▁The ▁reci pe ▁book ▁that ▁Br uster ' s ▁uses ▁consists ▁of ▁over ▁ 1 7 0 ▁reci pes ▁with ▁many ▁season al ▁favor ites . ▁Br uster ' s