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Alamy Stock Photo/ Heritage Image Partnership Ltd 50, Keystone Press 68, Pictorial Press Ltd 32, Science History Images 122.
European Southern Observatory 19.
Europeana Collections/ Finnish National Gallery 31; The European Library 19.
Shutterstock/ Aaron Amat 109; Aaron HY Chen 17; Africa Studio 83; Aha-Soft 47; Aleksandar Mijatovic 135; Alexy Kljatov 67; Alexyz3d 117; all_is_magic 87; Alted Studio 83; Andrey_Popov 6; Andy Dean Photography 15; AnEduard 71; Anton_Ivanov 6; Antonio Gravante 115; Aperture 75 67; Aphelleon 67, 117; Arcady 87; arka38 45; Ayse Pemra Yuce 43; Bedrin 95; Bikeworldtravel 113; Bildagentur Zoonar GmbH 103; Billion Photos 15; Bjorn Heller 99; Bruce Rolff 87, 131; Chjusman 121; cla78 139; Claudio Divizia 103; creative_design_2017 99; Cynthia Farmer 59; Dan Kosmayer 53; Daniela Pelazza 71; DariaRen 115; Dario Lo Presti 67; dashadima 15; Davydenko Yuliia 89; dencg 53; Denys Prykhodov 8; Dimitris Leonidas 15; DivinHX 131; Dogholiday 89; doomu 71, 109; Dreamcreation 73, 135; eAlisa 49; ekkapon 17; Elena Schweitzer 45; Elena100 31; enterphoto 89; Evannovostro 117; exopixel 61; Flipser 115; Flyingv3 21; Fresh_ Studio 119; Garumna 89; GarryKillian 129, 135; Georgios Kollidas 61; Giuseppe Donatiello 73; Good Shop Background 67; Green angel 103; GzP_Design 145; HomeStudio 25; horiyan 65; HPLTW 113; ibrandify gallery 89; ichadsgn 71; icolourful 17; ifong 17, 45; imagewriter 137; Ink Drop 139; itechno 17; iunewind 15, 61; Iurii Stepanov 109; Ivan Alex Burchak 119; Jacek Chabraszewski 97; Kai Celvin 117; KKulikov 27; Konstantin L 27; Kotin 89; KRAHOVNET 41; Kyryloff 27; Luria 91; locote 45; Lurii Stepamov 25; M. Unal Ozmen67; Macrovector 67; Makhh 63; Makhnack_S 29; Marso 141; martan 53; Matee Nuserm 139; Matt Benoit 25; mattesimages 83, 89; matthew25 97; Mauro Matacchione 27; Marzolino 84; mdbildes 111; melih2810 71; MicroOne 39; milart 141; Miloje 113; modustollens 113; montego 45, 95; Morphart Creation 145; Motionblur Studios 97; Mr. Rashad 21; musmellow 139; NadzeyaShanchuk 73; Nataliia Nata 97; Neamov 71; Nerthuz 15, 19; Nichca 7; Nikelser Kate 109; notbad 133; Oakozhan 87; Oleh Svetiukha 115; Oleksandr Panasovsky 115; Oleksiy Mark 129; Orn Rin 87; PaoloBruschi 133; Pavlo S 117; Peter Hermes Furian 145; phipatbig 117; Phonalamai Photo 117; photopixel 111; pikepicture 95; PixMarket 39; Rashevskyi Viacheslav 15; Robert Adrian Hilman 17; Robert Lucian Crusitu 109; Romanova Natali 131; Romariolen 45; Rost9 53; sansak 101; Sarah Holmlund 117; Savvapanf Photo 101; Sebastian Kaulitzki 119, 135; sebra 61; Seregam 61; Sergey Chayko 83; ShadeDesign 117; shahreen 47; sirtavelalot 41; Social Media Hub 89, 101; Sorbis 113; SP-Photo 45; stocker1970 45; Stu Shaw 29; Tatiana Shpeleva 43, 131; temp-64GTX 129; This Is Me 53; Thomas Pajot 147; TotemArt115; Trodler 15; Trong Nguyen 103; TwinkleStudio 25; Valex 133; Vector.design 117; vesna cvorovic 95; Vidual Generation 74; Vikpit 131; Vladystock 131, 133; VOLYK IEVGENII 29; whiteMocca 63; Whitevector 103; WhiteWings 25; WorldWide 103; Yes – Royalty Free 31, 67, 95, 97; Yevgenij_D 139; Zakharevych Vladyslav 119; Zentilla 121.
Smithsonian Libraries 141.
Stella Bowen (painting owned by the London School of Economics and Political Science) 142.
Wellcome Library, London 25, 39, 49, 61, 65, 77, 111, 135.
Wikimedia Commons/07bargem 135; A1E6 47; Adrignola 25; AlexNett22 133; Boivie/Maksim 37; Booya 137; cmglee 39; Cyc 133; Daderot 115, 145; DkEgy 134, 145; Ellasdabbas 135; EpochFail 141; Heds 1 49, 63; HiTe 63, 73; IkamusumeFan 59, 74; IllestFlip 111; Ilya Voyager 19; Jhedengren 133; Jjbeard 25; Johannes Ganz 19; Joseph Priestley 145; Kmf164 135; Lalala666 39; Martin Grandjean 135; Mehmet Atif Ergun 145; Mikael Häggström 97; Muhali 77; NASA 19, 49; Pearson Scott Foresman 49; Risani 109; Sigbert 77; Slashme 21; Trlkly 23; Twisp 111; Hermann Dietler 39; Wolfkeeper 25.
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