简介:<正>Fromshellsto"implement"coinsChinaisthebirthplaceofpapermoneyandoneoftheearliestusersofmetalcoinage.Intheearliesttimes,cowrieshellswerewidelyusedasmoney.Cowrieandtortoise,pearlsandpiecesofjadeareknowtohavebeenusedastokensofexchangebeforetheShangdynasty(16th-11thcenturyBC)andtohavecomeintowideuseduringthattime.Eventoday,Chinesecharactersconnectedwiththeideaofvalueorwealthcarrytheradi-
简介:EInk'smicrocapsulesarefilledwithaclearliquidthatholdsverysmallparticles.Someparticlesareblack.Somearewhite.Alloftheparticleshaveane-lectricalcharge.Tomakeasheetofelectronicpaper,engineersspreadmillionsoftheparticle-filledmicro-capsulesontoapieceofplastic.
简介:Allovertheworldmenaresearchingfornewtechniquestoprovideagreatdealofhousing,inexpensiveandquick,formillionsoflow-and-middle-incomefamilies,andtomeettheurgent(紧急的)housingrequirementscausedbyfloodandearthquakes.AcompanyinPennsylvania,theU.S.A.believesithasfoundonemethod,housesmadeofpaper.
简介:Thisisanaccountofthechangesinfunding,administration,andmanagementoftheBritishGeologicalSurvey(BGS),theoldestgovernment-fundedgeologicalsurveyintheworld,fromtheearly1980sto2000.Itwillintereststudentsofpublicadministration,historiansofscienceandgeologicalsurveys,andthosewhohavefollowedtheconvolutedrecenthistoryofBGS.PeterAllenhasrenderedamostvaluableserviceindocumentinganddescribingasaninsider(heonlyrecentlyretiredfromapositionasAssistantDirector)thestrugglestomaintaintheSurveyanditsprimeroleofdiscovering,