Allovertheworldmenaresearchingfornewtechniquestoprovideagreatdealofhousing,inexpensiveandquick,formillionsoflow-and-middle-incomefamilies,andtomeettheurgent(紧急的)housingrequirementscausedbyfloodandearthquakes.AcompanyinPennsylvania,theU.S.A.believesithasfoundonemethod,housesmadeofpaper.