02068nam  2200301 a 4500001000400000003000800004005001700012006001100029007000700040008004100047040002400088050002800112082001200140245004100152260003500193490006200228500006700290506003500357520012100392520032600513505040400839538004801243650005101291650004701342653028001389710002101669856007601690763EOS.Web20090416085150.0m    |   mcr |||090416s2009    ilu|   |s|    00| 0|eng    aDNAL/DLCcDLCdICWB00aS494.5.I5  bA3262 200900a63022200aAgriculture h[electronic resource].  aChicago :bWorld Book,cc2009.0 aWorld Book digital libraries : inventions and discoveries  aIncludes glossary, index, and a list of recommended web sites.  aAccess limited to subscribers.  a"An exploration of the transformative impact of inventions and discoveries in agriculture" -- Provided by publisher.  a"World Book Digital Libraries offer an online, interactive complement to World Book's most popular print reference sets. Each library features all the content from the print set as well as videos and animations, interactive activities, curriculum correlations, and links to encyclopedic content" -- Provided by publisher.0 aThe domestication of plants and animals -- The hoe -- The plow -- Irrigation -- Crop rotation -- The water mill and water wheel -- The windmill -- The horse harness -- The seed drill -- The Norfolk system -- The cotton gin -- The steel plow -- The reaper -- The grain elevator -- The tractor -- Fertilizer -- Hybrid crops -- Pesticides -- Genetically modified food -- Important dates in agriculture.  aSystem requirements: Internet connectivity. 0aAgricultural innovationsvJuvenile literature. 0aAgriculturexHistoryvJuvenile literature.  aFertile CrescentaWind turbinesaAgricultural RevolutionaCrop rotationaFertilizeraCharles TownshendaEli WhitneyaJohn DeereaCyrus Hall McCormickaErie CanalaIndustrial RevolutionaPlowsaOrganic farmersaDroughtaBacteriaaNutrientsaPollutionaDNAaGenetic engineering2 aWorld Book, Inc.4 uhttp://www.worldbookonline.com/digitallibraries/inventions/volume?id=2602248nam  2200325 a 4500001000400000003000800004005001700012006001100029007000700040008004100047040001900088050002600107082001600133245005700149260003500206490006200241500006700303520015200370506003500522520032500557505037200882538004801254650005401302650006601356650003801422650003701460653032801497710002101825856007601846765EOS.Web20090416090335.9m    |   mcr |||090416s2009    ilu|   |s|    00| 0|eng    aDLCcDLCdICWB00aNA2543.T43bA718 200900a720.10522200aArchitecture and engineeringh[electronic resource].  aChicago :bWorld Book,cc2009.0 aWorld Book digital libraries : inventions and discoveries  aIncludes glossary, index, and a list of recommended web sites.  a"An exploration of the transformative impact of inventions and discoveries in the fields of architecture and engineering" -- Provided by publisher.  aAccess limited to subscribers.  a"World Book Digital Libraries offer an online, interactive complement to World Book's most popular print reference sets. Each library features all the content from the print set as well as videos and animations, interactive activities, curriculum correlations, and links to encyclopedic content" -- Publisher's web site.0 aPyramids -- Pagodas -- Cantilevers -- City planning -- Aqueducts -- Dams -- Arch technology -- Domes -- Drawbridge design -- Truss support -- Suspension bridge -- Underwater tunnels -- Flushing toilet -- Modern sewage systems -- Central heating -- Air conditioning -- Electric elevator -- Skyscraper -- Solar energy -- Important dates in architecture and engineering.  aSystem requirements: Internet connectivity. 0aArchitecture and technologyvJuvenile literature. 0aArchitecturexTechnological innovationsvJuvenile literature. 0aEngineeringvJuvenile literature. 0aInventionsvJuvenile literature.  aChinaaAncient GreeceaAncient RomeaMesopotamiaaMiddle AgesaHippodamusaGrid planaMarcus AgrippaaWaterworksaThree Gorges DamaGateway ArchaFilippo BrunelleschiaGolden Gate BridgeaChannel Tunnel (Chunnel)aBenjamin FranklinaGlobal warmingaSewageaWastewater treatment systemaSolar panelsaPantheonaAncient Egypt2 aWorld Book, Inc.4 uhttp://www.worldbookonline.com/digitallibraries/inventions/volume?id=2702182nam  2200301 a 4500001000400000003000800004005001700012006001100029007000700040008004100047040001900088050002400107082001600131245003700147260003500184490006200219500006700281520011700348506003500465520032500500505040600825538004801231650005001279650005801329653039601387710002101783856007601804767EOS.Web20090416092317.4m    |   mcr |||090416s2009    ilu|   |s|    00| 0|eng    aDLCcDLCdICWB00aNX180.T4bA789 200900a700.10522204aThe artsh[electronic resource].  aChicago :bWorld Book,cc2009.0 aWorld Book digital libraries : inventions and discoveries  aIncludes glossary, index, and a list of recommended web sites.  aAn exploration of the transformative impact of inventions and discoveries in the arts" -- Provided by publisher.  aAccess limited to subscribers.  a"World Book Digital Libraries offer an online, interactive complement to World Book's most popular print reference sets. Each library features all the content from the print set as well as videos and animations, interactive activities, curriculum correlations, and links to encyclopedic content" -- Publisher's web site.0 aThe hammered dulcimer -- The harpischord -- The organ -- The piano -- The electric keyboard -- The microphone -- The phonograph -- The tape recorder -- The compact disc and digital recording -- Painting: tempera paint -- Oil paint -- Acrylic paint -- The camera obscura -- The camera -- Film development -- Motion pictures -- Animation -- Soundtracks -- Digital cameras -- Important dates in the arts.  aSystem requirements: Internet connectivity. 0aTechnology and the artsvJuvenile literature. 0aArtsxTechnological innovationsvJuvenile literature.  aJohann Sebastian BachaRenaissanceaClavichordaElectric pianosaSynthesizeraSound wavesaAmplifiersaCompact disc (CD)aElectromagnet,aCassette tapes,aInternetaDigital music filesaPaint pigmentsaRenaissanceaImpressionismaFrescoaMuralsaFilmaDaguerreotypesaMathew BradyaGeorge EastmanaKodak cameraaFilm projectoraEadweard MuybridgeaWalt DisneyaHollywoodaPhotographyaMovies2 aWorld Book, Inc.  uhttp://www.worldbookonline.com/digitallibraries/inventions/volume?id=2802357nam  2200301 a 4500001000400000003000800004005001700012006001100029007000700040008004100047040001900088050002100107082001200128245003800140260003600178490006200214500006700276520013200343506003500475520032500510505047700835538004801312650003601360650004501396653051701441710002101958856007601979769EOS.Web20090416093434.0m    |   mcr |||090416s2009    ilu|   |s|    00| 0|eng    aDLCcDLCdICWB00aQB46b.A879 200900a52022200aAstronomyh[electronic resource].  aChicago : bWorld Book,cc2009.0 aWorld Book digital libraries : inventions and discoveries  aIncludes glossary, index, and a list of recommended web sites.  a"An exploration of the transformative impact of inventions and discoveries in the field of astronomy" -- Provided by publisher.  aAccess limited to subscribers.  a"World Book Digital Libraries offer an online, interactive complement to World Book's most popular print reference sets. Each library features all the content from the print set as well as videos and animations, interactive activities, curriculum correlations, and links to encyclopedic content" -- Publisher's web site.0 aConstellations across the sky -- Calendar stones -- Sundials -- The Earth is round -- The stars as guides -- The modern calendar -- The telescope -- Understanding the solar system -- Planetariums -- The law of gravitation -- The seventh planet: Uranus -- The Messier catalog -- The eighth planet: Neptune -- Black Holes -- Time zones -- Atomic time -- The first human on the moon -- The Hubble space telescope -- The definition of a planet -- Important dates in astronomy.  aSystem requirements: Internet connectivity. 0aAstronomyvJuvenile literature. 0aAstronomyxHistoryvJuvenile literature.  aGalaxiesaCometsaAstrologyaPtolemy,aStonehengeaLunar and solar eclipsesaMaya calendarsaPueblo Indian peoplesaSun DaggeraEratosthenesaAstrolabeaSextantaLunar monthaSolar yearaLeap year,aGregorian calendaraJulian CalendaraGalileo GalileiaReflecting telescopeaNicolaus CopernicusaKepler's Laws of Planetary MotionaSir Isaac NewtonaNewton's law of gravitationaCharles MessieraSupernovaaAlbert EinsteinaStandard timeaGreenwich meridianaAtomic clockaAstronautsaNASAaDwarf planetaUniverse2 aWorld Book, Inc.4 uhttp://www.worldbookonline.com/digitallibraries/inventions/volume?id=2902128nam  2200289 a 4500001000400000003000800004005001700012006001100029007000700040008004100047040001900088050002400107082001400131245004300145260003500188490006200223500006700285520012300352506003500475520032500510505034000835538004801175650007601223653044201299710002101741856007601762771EOS.Web20090416103042.2m    |   mcr |||090416s2009    ilu|   |s|    00| 0|eng    aDLCcDLCdICWB00aP96.T42bC5985 200900a302.222200aCommunication h[electronic resource].  aChicago :bWorld Book,cc2009.0 aWorld Book digital libraries : inventions and discoveries  aIncludes glossary, index, and a list of recommended web sites.  a"An exploration of the transformative impact of inventions and discoveries in communication" -- Provided by publisher.  aAccess limited to subscribers.  a"World Book Digital Libraries offer an online, interactive complement to World Book's most popular print reference sets. Each library features all the content from the print set as well as videos and animations, interactive activities, curriculum correlations, and links to encyclopedic content" -- Publisher's web site.0 aLanguage and writing -- The alphabet -- Paper -- Movable type -- The printing press -- Lithography -- The electric telegraph -- The fax machine -- The typewriter -- The telephone -- The linotype -- Radio -- The handheld radio -- Television -- The satellite -- The internet -- The cellular phone -- Digital television -- The smartphone.  aSystem requirements: Internet connectivity. 0aCommunicationxTechnological innovationsxHistoryvJuvenile literature.  aEgyptian hieroglyphicsaSemitic alphabetaPhoenician alphabetaBlock printingaMovable typeaRenaissanceaJohannes GutenbergaIndustrial RevolutionaAlexander Graham BellaRadio signalsaElectric currentaElectromagnetic wavesaTransmittersaAntennasaWorld Wide WebaSearch enginesaHigh-definition television (HDTV)aE-mailaGlobal Positioning System (GPS)aPersonal computeraJames MaxwellaGuglielmo MarconiaNikola TeslaaCell phone2 aWorld Book, Inc.4 uhttp://www.worldbookonline.com/digitallibraries/inventions/volume?id=3002107nam  2200301 a 4500001000400000003000800004005001700012006001100029007000700040008004100047040001900088050002400107082001200131245004100143260003500184490006200219500006700281520012100348520032500469505036600794538004801160650007001208650004701278650005101325653033201376710002101708856007601729773EOS.Web20090416104023.7m    |   mcr |||090416s2009    ilu|   |s|    00| 0|eng    aDLCcDLCdICWB00aQA135.6b.M376 200900a51022200aMathematics h[electronic resource].  aChicago :bWorld Book,cc2009.0 aWorld Book digital libraries : inventions and discoveries  aIncludes glossary, index, and a list of recommended web sites.  a"An exploration of the transformative impact of inventions and discoveries in mathematics" -- Provided by publisher.  a"World Book Digital Libraries offer an online, interactive complement to World Book's most popular print reference sets. Each library features all the content from the print set as well as videos and animations, interactive activities, curriculum correlations, and links to encyclopedic content" -- Publisher's web site.0 aIntroduction -- the Abacus -- Numerals -- Fractions -- Units of length -- The Pythagorean theorem -- Geometry -- Prime numbers -- The value of Pi -- Algebra -- The concept of zero -- The decimal system -- The sector -- Calculators -- The probability theory -- The binary number system -- Calculus -- The metric system -- The mechanical computer -- Chaos theory.  aSystem requirements: Internet connectivity. 0aMathematicsxStudy and teaching (Secondary)vJuvenile literature. 0aMathematicsxHistoryvJuvenile literature. 0aMathematical instrumentsvJuvenile literature.  aRoman numeralsaDecimal systemaPythagorasaDeductive reasoningaEuclidaAncient GreeceaArchimedesaAl-Khwarizmi (Arab mathematician)aEquationsaGalileoaPierre de FermataBlaise PascalaGottfried Wilhelm LeibnizaSir Isaac NewtonaEnlightenmentaCharles BabbageaPersonal computeraInternetaBenoit MandelbrotaAncient Egypt2 aWorld Book, Inc.4 uhttp://www.worldbookonline.com/digitallibraries/inventions/volume?id=3302182nam  2200289 a 4500001000400000003000800004005001700012006001100029007000700040008004100047040001900088050002000107082001200127245005700139260003500196490006200231500006700293520017300360520032500533505037400858538004801232650003701280650003701317653044101354710002101795856007601816775EOS.Web20090416105122.9m    |   mcr |||090416s2009    ilu|   |s|    00| 0|eng    aDLCcDLCdICWB00aT48b.P464 200900a60922200aPersonal and household itemsh[electronic resource].  aChicago :bWorld Book,cc2009.0 aWorld Book digital libraries : inventions and discoveries  aIncludes glossary, index, and a list of recommended web sites.  a"An exploration of the transformative impact of inventions and discoveries that led to the development of common personal and household items" -- Provided by publisher.  a"World Book Digital Libraries offer an online, interactive complement to World Book's most popular print reference sets. Each library features all the content from the print set as well as videos and animations, interactive activities, curriculum correlations, and links to encyclopedic content" -- Publisher's web site.0 aIntroduction -- Scissors -- Soap -- The glass mirror -- The fork -- The toothbrush -- Eyeglasses -- The thermometer -- The wristwatch -- The battery -- The light bulb -- The sewing machine -- Canned foods -- Blue jeans -- The zipper -- Crayons -- The vacuum cleaner -- The microwave oven -- Instant noodles -- Video games -- Important dates in personal household items.  aSystem requirements: Internet connectivity. 0aInventionsvJuvenile literature. 0aTechnologyvJuvenile literature.  aPhoeniciansaMiddle AgesaBlack DeathaBacteriaaHygieneaNicolas LeblancaReflecting telescopeaContact lensesaGabriel Daniel FahrenheitaAnders CelsiusaSundialsaPeter HenleinaMichael FaradayaIncandescent lightaSir Humphry DavyaThomas Alva EdisonaCompact fluorescent light bulbsaNicolas AppertaPreserved foodsaElias HoweaLevi StraussaPatentaNintendo Entertainment System (NES)aPersonal computersaInternetaSocial gaming2 aWorld Book, Inc.4 uhttp://www.worldbookonline.com/digitallibraries/inventions/volume?id=3502039nam  2200301 a 4500001000400000003000800004005001700012006001100029007000700040008004100047040001900088050002700107082001200134245005500146260003500201490006200236500006700298520013600365506003500501520032500536505035200861538004801213650006501261650003701326653027701363710002101640856007601661777EOS.Web20090416112218.0m    |   mcr |||090416s2009    ilu|   |s|    00| 0 eng    aDLCcDLCdICWB00aQ180.55.D57bI344 200900a60922200aIndustry and manufacturingh[electronic resource].  aChicago :bWorld Book,cc2009.0 aWorld Book digital libraries : inventions and discoveries  aIncludes glossary, index, and a list of recommended web sites.  a"An exploration of the transformative impact of inventions and discoveries in industry and manufacturing" -- Provided by publisher.  aAccess limited to subscribers.  a"World Book Digital Libraries offer an online, interactive complement to World Book's most popular print reference sets. Each library features all the content from the print set as well as videos and animations, interactive activities, curriculum correlations, and links to encyclopedic content" -- Publisher's web site.0 aIntroduction -- Fire -- Manufactured glass -- Gears -- Pulleys and levers -- Concrete -- Coal -- The steam engine -- Electricity and magnetism -- The petroleum industry -- Steel -- Refrigeration -- Plastics -- Steam turbines -- The assembly line -- Adhesives -- Lasers -- Robotics -- Biotechnology -- Important dates in industry and manufacturing.  aSystem requirements: Internet connectivity. 0aDiscoveries in sciencexSocial aspectsvJuvenile literature. 0aInventionsvJuvenile literature.  aJames WattaHenry FordaAlbert EinsteinaCharles H. TownesaSamuel F.B. MorseaWilliam MurdockaJames Clerk MaxwellaBenjamin FranklinaMichael FaradayaJoseph HenryaWilliam ShockleyaWalter H. BrattainaJohn BardeenaLeo BaekelandaTheodore H. MaimanaCharles A. Parsons2 aWorld Book, Inc.4 uhttp://www.worldbookonline.com/digitallibraries/inventions/volume?id=3202097nam  2200313 a 4500001000400000003000800004005001700012006001100029007000700040008004100047040001900088050002200107082001200129245003800141260003500179490006200214500006700276520013200343506003500475520032500510505041300835538004801248650003601296650004301332650003701375653027401412710002101686856007601707779EOS.Web20090416114647.6m    |   mcr |||090416s2009    ilu|   |s|    00| 0|eng    aDLCcDLCdICWB00aHB183b.E262 200900a33022200aEconomicsh[electronic resource].  aChicago :bWorld Book,cc2009.0 aWorld Book digital libraries : inventions and discoveries  aIncludes glossary, index, and a list of recommended web sites.  a"An exploration of the transformative impact of inventions and discoveries in the field of economics" -- Provided by publisher.  aAccess limited to subscribers.  a"World Book Digital Libraries offer an online, interactive complement to World Book's most popular print reference sets. Each library features all the content from the print set as well as videos and animations, interactive activities, curriculum correlations, and links to encyclopedic content" -- Publisher's web site.0 aIntroduction -- Features of an economy: tax collection -- Minted coins -- Banks -- Paper money -- Checks -- Stock markets -- Insurance -- The gold standard -- Labor unions -- Mail-order businesses -- Credit cards -- The bar code -- The automated teller machine -- Electronic commerce -- Economic systems: feaudalism -- Mercantilism -- Capitalism -- Communism -- Globalization -- Important dates in economics.  aSystem requirements: Internet connectivity. 0aEconomicsvJuvenile literature. 0aEconomic historyvJuvenile literature. 0aInventionsvJuvenile literature.  aCurrencyaFederal Reserve SystemaStock exchangeaCode of HammurabiaAaron Montgomery WardaE-commerceaMiddle AgesaAdam SmithaWealth of Nations (1776)aLaissez faireaFree-market systemaKarl MarxaDas KapitalaDepressionsaIndustrial RevolutionaEuropean Union (EU)2 aWorld Book, Inc.4 uhttp://www.worldbookonline.com/digitallibraries/inventions/volume?id=3102147nam  2200289 a 4500001000400000003000800004005001700012006001100029007000700040008004100047040001900088050002200107082001200129245003700141260003500178490006200213500006700275520013100342506003500473520032500508505039600833538004801229650003501277650004601312653042301358856007601781781EOS.Web20090416120144.5m    |   mcr |||090416s2009    ilu|   |s|    00| 0|eng    aDLCcDLCdICWB00aR130.5b.M42 200900a61022200aMedicineh[electronic resource].  aChicago :bWorld Book,cc2009.0 aWorld Book digital libraries : inventions and discoveries  aIncludes glossary, index, and a list of recommended web sites.  a"An exploration of the transformative impact of inventions and discoveries in the field of medicine" -- Provided by publisher.  aAccess limited to subscribers.  a"World Book Digital Libraries offer an online, interactive complement to World Book's most popular print reference sets. Each library features all the content from the print set as well as videos and animations, interactive activities, curriculum correlations, and links to encyclopedic content" -- Publisher's web site.0 aIntroduction -- Early surgery -- The discovery of germs -- The smallpox vaccine -- Anesthesia -- Aspirin -- Antiseptics - The x ray -- The electrocardiograph -- Insulin -- Penicillin -- Antibiotics -- Chemotherapy -- The polio vaccine -- Organ transplants -- The artificial heart --- Laser surgery -- Imaging technologies -- Gene therapy -- Stem cell research -- Important dates in medicine.  aSystem requirements: Internet connectivity. 0aMedicinevJuvenile literature. 0aMedical innovationsvJuvenile literature.  aLouis PasteuraEdward JenneraWilhelm Conrad RoentgenaPaul EhrlichaJonas Edward SalkaJoseph E. MurrayaTheodore H. MaimanaSir Frederick Grant BantingaWillem EinthovenaHoward FloreyaRobert KochaPaul C. LauterburaChristian BarnardaErnst ChainaCharles H. BestaSir Humphry DavyaAllan Cormack,aAnton van LeeuwenhoekaPeter MansfieldaCrawford W. LongaIgnaz P. SemmelweisaSir James SimpsonaSelman A. Waksman4 uhttp://www.worldbookonline.com/digitallibraries/inventions/volume?id=3402268nam  2200301 a 4500001000400000003000800004005001700012006001100029007000700040008004100047040001900088050002100107082001200128245004400140260003500184490006200219500006700281520012400348506003500472520032500507505042600832538004801258650005001306650006501356653044801421710002101869856007601890783EOS.Web20090416121259.7m    |   mcr |||090416s2009    ilu|   |s|    00| 0|eng    aDLCcDLCdICWB00aHE152b.T67 200900a38822200aTransportation h[electronic resource].  aChicago :bWorld Book,cc2009.0 aWorld Book digital libraries : inventions and discoveries  aIncludes glossary, index, and a list of recommended web sites.  a"An exploration of the transformative impact of inventions and discoveries in transportation" -- Provided by publisher.  aAccess limited to subscribers.  a"World Book Digital Libraries offer an online, interactive complement to World Book's most popular print reference sets. Each library features all the content from the print set as well as videos and animations, interactive activities, curriculum correlations, and links to encyclopedic content" -- Publisher's web site.0 aIntroduction -- The wheel -- The sail -- The sternpost rudder -- The stirrup -- The magnetic compass -- The horse and carriage -- The balloon -- The steam locomotive -- The steamboat -- The bicycle -- The automobile -- The airplane -- The electric starter -- The jet engine -- The helicopter -- The maglev train -- The space shuttle -- The global positioning system -- The hybrid car -- Important dates in transportation.  aSystem requirements: Internet connectivity. 0aTransportationxHistoryvJuvenile literature. 0aTransportationzUnited StatesxHistoryvJuvenile literature.  aStagecoachesaPublic transportation systemsaAirshipsaHindenburgaSteam engineaDiesel and electric locomotivesaRobert FultonaClermontaInternal combustion engineaHenry FordaPollutionaGlideraPropellersaJet enginesaThe Wright BrothersaKitty HawkaCharles LindberghaAmelia EarhartaCharles KetteringaCharles YeageraLeonardo da VinciaSally RideaSatellitesaGlobal Positioning System (GPS)aRadio signalsaGlobal warmingaHybrid car2 aWorld Book, Inc.4 uhttp://www.worldbookonline.com/digitallibraries/inventions/volume?id=3602324nam  2200301 a 4500001000400000003000800004005001700012006001100029007000700040008004100047040001900088050002100107082001500128245003700143260003500180490006200215500006700277520012100344506003500465520032500500505040900825538004801234650006101282650005201343653053001395710002101925856007601946785EOS.Web20090416122340.2m    |   mcr |||090416s2009    ilu|   |s|    00| 0|eng    aDLCcDLCdICWB00aU106b.W325 200900a355.0222200aWarfare h[electronic resource].  aChicago :bWorld Book,cc2009.0 aWorld Book digital libraries : inventions and discoveries  aIncludes glossary, index, and a list of recommended web sites.  a"An exploration of the transformative impact of the inventions and discoveries in warfare" -- Provided by publisher.  aAccess limited to subscribers.  a"World Book Digital Libraries offer an online, interactive complement to World Book's most popular print reference sets. Each library features all the content from the print set as well as videos and animations, interactive activities, curriculum correlations, and links to encyclopedic content" -- Publisher's web site.0 aIntroduction -- Early weapons -- Cavalry -- The sword -- Forts and castles -- The catapult -- Body armor -- Gunpowder -- Guns -- Rifles, repeaters, and machine guns -- Cannons and artillery -- Rockets and guided missiles -- Chemical warfare -- Early warships -- Modern warships -- Tanks -- Airships -- Fighters and bombers -- Nuclear weapons -- Recent inventions in warfare -- Important dates in warfare.  aSystem requirements: Internet connectivity. 0aMilitary art and sciencexHistory vJuvenile literature. 0aMilitary weaponsxHistoryvJuvenile literature.  aThutmose III (king of ancient Egypt)aChariotaArcheraCrossbowaArmoraMiddle AgesaMusketaRifleaAmmunitionaFortressesaFortificationsaBig BerthaaRadio wavesaRadaraAgent OrangeaSteam engineaBattleshipsaSubmarinesaAircraft carriersaAerial warfareaPearl HarboraWestern FrontaTrench warfareaBombersaBaron Manfred von RichthofenaJ. Robert OppenheimeraAtomic bombaNuclear weaponsaSatellitesaLasersaUnmanned aerial vehicle (UAV)aAncient RomeaAncient GreeceaHiroshimaaZeppelinsaWorld War IaWorld War II2 aWorld Book, Inc.4 uhttp://www.worldbookonline.com/digitallibraries/inventions/volume?id=37