▁ 1 0 ▁p pm ▁( 5 0   m g / m 3 ) ▁over ▁an ▁eight - hour ▁work day . ▁ ▁References ▁ ▁Category : Di eth yl am ino ▁comp ounds ▁Category : Primary ▁alco h ols ▁Category : E than ol am ines <0x0A> </s> ▁N ex us ▁O ps ▁is ▁a ▁board ▁game , ▁designed ▁by ▁Charlie ▁Cat ino ▁and ▁released ▁in ▁ 2 0 0 5 ▁by ▁A val on ▁Hill . ▁Play ers ▁attempt ▁to ▁mine ▁the ▁fict it ious ▁metal ▁" r ub ium " ▁on ▁a ▁moon ▁far ▁off ▁in ▁space . ▁Each ▁player ▁uses ▁rub ium ▁to ▁rec ruit ▁units ▁to ▁mine ▁and ▁fight ▁for ▁the ▁player . ▁Play ers ▁can ▁employ ▁humans , ▁as ▁well ▁as ▁fung oid s , ▁cry st all ines , ▁rock ▁str iders , ▁la va ▁le apers , ▁and ▁rub ium ▁drag ons . ▁Each ▁creature ▁has ▁a ▁different ▁attack ▁value , ▁and ▁some ▁of ▁them ▁have ▁special ▁ab ilities . ▁The ▁goal ▁is ▁to ▁get ▁ 1 2 ▁victory ▁points , ▁which ▁are ▁obtained ▁by ▁winning ▁batt les ▁and ▁accomplish ing ▁secret ▁miss ions . ▁The ▁number ▁of ▁victory ▁points ▁can ▁be ▁changed ▁to ▁make ▁for ▁a ▁longer ▁or ▁shorter ▁game . ▁ ▁The ▁board ▁consists ▁of ▁three ▁home base ▁he xes ▁for ▁each ▁player , ▁in ▁addition ▁to ▁nin ete en ▁he xes ▁outside ▁of ▁the ▁players ' ▁home b ases . ▁ ▁The ▁hex ▁in ▁the ▁center ▁of ▁the ▁board ▁is ▁always