271 Bildnachweis S. 10.1: DragonImages / Getty Images – iStockphoto; S. 10.2: klug-photo / Getty Images; S. 11.1: AlexRaths / Getty Images – iStockphoto; S. 11.2: Scharvik / Getty Images – iStockphoto; S. 12.1: EduLeite / iStockphoto.com; S. 12.2: sunlow / Getty Images – iStockphoto; S. 12.3: Matthias Lindner / Getty Images – iStockphoto; S. 13: boonsom / Thinkstock; S. 14.1: Bruno_il_ segretario / Thinkstock; S. 14.2: Jan Beltz / Fotolia; S. 15.1: asbe / Getty Images – iStockphoto; S. 15.2: tharrison / Getty Images; S. 18.1: Marius Gheorghe Barzu / green_casius / Getty Images – iStockphoto; S. 18.2: mrzazaz / Getty Images – iStockphoto; S. 20: AntonioGuillem / Getty Images – iStockphoto; S. 21: Jack Hollingsworth / Photodisc / Thinkstock; S. 23: © wissner by: greenstories.de; S. 24: Lazy_Bear / Getty Images – iStockphoto; S. 28: akg-images / picturedesk.com; S. 31: Sabine Luxem / Fotolia; S. 33: MyImages_Micha / Getty Images – iStockphoto; S. 36: Nadzeya Haroshka / Getty Images – iStockphoto; S. 38: akg-images / picturedesk.com; S. 39.1: Eugene Delacroix / Imagno / picturedesk.com; S. 39.2: Dejvice6 / Getty Images – iStockphoto; S. 42: Martina Draper Photography, Wödern; S. 47: SerrNovik / Getty Images – iStockphoto; S. 51: MysteryShot / Getty Images; S. 52: Iryna Murselovic, MSc / öbv, Wien; S. 54: Diego Cervo / Getty Images – iStockphoto; S. 56: Prostock-studio / Shutterstock; S. 62.1: mauritius images / Alamy Stock Photos / Art Collection 2; S. 62.2: Sammlung Rauch / Interfoto / picturedesk.com; S. 63.1: Science Photo Library / picturedesk.com; S. 63.2: Science Source / PhotoResearchers / picturedesk.com; S. 64: monkeybusinessimages / Thinkstock; S. 66.1: kristina rütten / Fotolia; S. 66.2: Doris Heinrichs / Fotolia; S. 68: lev dolgachov / Fotolia – Syda Productions – stock.adobe.com; S. 69: gbh007 / iStockphoto.com; S. 72: akgimages; S. 74: woodwizard12000/Getty Images/iStockphoto; S. 75.1: Gottfried Wilhelm Leibniz Bibliothek – Niedersächsische Landesbibliothek; S. 75.2: Alan Richards photographer. From the Shelby White and Leon Levy Archives Center, Institute for Advanced Study, Princeton, NJ, USA; S. 77: kozmoat98/Getty Images; S. 78: edelmar / Getty Images; S. 81: Fandrade/Getty Images; S. 82: Friedberg / Fotolia; S. 87: jxfzsy / Getty Images – iStockphoto; S. 92: volff – stock.adobe.com; S. 93: Yuri Tuchkov/Colourbox.com; S. 94: LukaTDB / Getty Images – iStockphoto; S. 95.1: Markus Mainka / Fotolia; S. 95.2: Lazy_Bear/ Getty Images; S. 96: Mauricio Graiki / Getty Images – iStockphoto; S. 99.2: Wiener Börse; S. 99.1: Bangon Pitipong / Getty Images; S. 104: Anonym / Imagno / picturedesk.com; S. 105: MH Foto Design; S. 106: Iryna Murselovic, MSc / öbv, Wien; S. 107: wakila / iStockphoto.com; S. 112: Halfpoint / Getty Images – iStockphoto; S. 115: ChamilleWhite / Getty Images – iStockphoto; S. 116: SDI Productions / Getty Images; S. 119: dionisvero / Thinkstock; S. 122: Mariha-kitchen / Getty Images – iStockphoto; S. 134.1: American Philosophical Society / Science Photo Library / picturedesk.com; S. 134.2: akg-images / picturedesk.com ; S. 138: JayLazarin / Getty Images; S. 139: contrastwerkstatt / Fotolia; S. 140: Sven Ole Schubert / EyeEm / Getty Images; S. 142: Zauberhut / Fotolia; S. 144: FatCamera / Getty Images – iStockphoto; S. 146: SolStock/Getty Images; S. 148: MEV / allOver / picturedesk.com; S. 149: VeranoVerde / Getty Images / iStockphoto; S. 150.4:; S. 150.5: Tobias Bräuning / Fotolia; S. 154: Безгодов / Getty Images / iStockphoto; S. 155: DoraZett / Fotolia; S. 157: Nataliia Mach / Alamy Stock Photo; S. 159: Muralinath / Getty Images / iStockphoto; S. 162: akg-images / picturedesk.com; S. 163.3: Iryna Murselovic, MSc / öbv, Wien; S. 163.1: Science Photo Library / picturedesk.com; S. 163.2: Hervé Champollion / akg-images / picturedesk.com; S. 164: Iryna Murselovic, MSc / öbv, Wien; S. 167.1: Ababsolutum / Getty Images; S. 167.2: byvalet / Shutterstock; S. 168: Andreas Haertle / Fotolia; S. 171: photohampster / Getty Images – iStockphoto; S. 172: fotofuerst / Fotolia; S. 173: lakeemotion / Fotolia.com; S. 174: Peter Burnett / iStockphoto.com; S. 176.1: AND Inc. / iStockphoto.com; S. 176.2: EduLeite / iStockphoto.com; S. 177: JPLDesigns / Getty Images – iStockphoto; S. 178.1: robyvannucci / Getty Images – iStockphoto; S. 178.2: kiruk / Getty Images – iStockphoto; S. 178.3: gettysteph Mignon Stephane / Getty Images; S. 180.1: Roger-Viollet / Roger Viollet / picturedesk.com; S. 180.2: Griechische Post / z.V.g.v. Dr. Manfred Börgens; S. 182: Wavebreakmedia / Getty Images – iStockphoto; S. 185: Rudzhan Nagiev / Getty Images – iStockphoto; S. 187: Martina Draper Photography, Wödern; S. 189: Stephan Zabel / iStockphoto; S. 190: Wanderhotel Gassner, Neukirchen; S. 191: golibo / Getty Images – iStockphoto; S. 194: Iryna Murselovic, MSc / öbv, Wien; S. 196: juergen2008 / Getty Images – iStockphoto; S. 198: moonrun / Fotolia; S. 201.1: Jacqueline Guillot / akg-images / picturedesk.com; S. 201.2: Reklame Kontor Peter Franc, Wien; S. 204: Alois / Fotolia; S. 205: Karim Hesham / iStockphoto.com; S. 207.1: rraheb / Thinkstock; S. 207.2: Pia Moest / öbv, Wien; S. 208: Francesco Ferrarini / Shutterstock; S. 212.1: Patrick Pierrain / Roger Viollet / picturedesk.com; S. 212.2: akg-images / picturedesk.com; S. 213: Jupiterimages / Getty Images; S. 214: umesh chandra / Getty Images; S. 215: Baloncici / Thinkstock; S. 216.1: Arjan de Jager / iStockphoto. com; S. 216.2: southerlycourse / Getty Images – iStockphoto; S. 216.3: Netzer Johannes / Fotolia; S. 217: Imgorthand / Getty Images; S. 219: Lusyaya / Getty Images – iStockphoto; S. 220.1: Jan-Otto / Getty Images – iStockphoto; S. 220.2: flubydust / Getty Images – iStockphoto; S. 221: Lusyaya / Getty Images – iStockphoto; S. 222.1: bravo1954 / Getty Images; S. 222.2: Mateusz Atroszko / Getty Images – iStockphoto; S. 222.3: Uros Petrovic – Thinkstock; S. 222.4: megakunstfoto / Getty Images – iStockphoto; S. 223: ablokhin / Getty Images – iStockphoto; S. 224: M.Rosenwirth / Fotolia; S. 225.1: remar / Fotolia; S. 225.2: HAYKIRDI / Getty Images; S. 226.2: kirych / Getty Images – iStockphoto; S. 226.3: ChrisDoDutch / Getty Images – iStockphoto; S. 226.1: DmitLVStock / Shutterstock; S. 227: Ayahe Stock / stock.adobe.com; S. 238: Michael Schmeling / stock. adobe.com; S. 243: Thaut Images / stock.adobe.com; S. 244: Ernst Daniel Scheffler / Thinkstock; S. 249: PhotoRedHeart / Shutterstock GeoGebra Institute: S. 36–37, 128–133, 160–161, 230–233 Illustrationen: Mag. Adam Silye, Wien: S. 76.1, S. 150.1, S. 150.2, S. 150.3, S. 150.7, S. 152, S. 153 Nur zu Prüfzwecken – Eigentum des Verlags öbv
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