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(Click for frequent words.) 69 Neanderthal fossils 63 Neanderthal bones 62 woolly rhinoceros 60 dinosaur specimens 60 dinosaur precursors 59 Homo sapiens evolved 59 earliest hominid 59 King Herod tomb 59 San Sebastiano cemetery 59 renowned astrophysics observatory 59 partial skeleton 59 archaelogists 59 Europasaurus 58 medieval archeology 58 nicknamed Ardi 58 science journal Naturwissenschaften 58 H. habilis 58 fossilized skull 58 braincase 57 fossilized skulls 57 stony meteorites 57 Neanderthal genes 57 radiocarbon tests 57 Heterodontosaurus 57 microfossils 56 Neandertal 56 coprolites 56 fossilized footprints 56 Stolen Monet 56 radiocarbon analysis 56 Paranthropus robustus 56 A. ramidus 56 microscopic fossils 56 Homo ergaster 56 fossilized claw 56 Denisovan 56 fossilized creatures 56 Homo neanderthalensis 56 cu Oase 56 Denisova cave 56 Aramaic texts 56 ivory flutes 56 stromatolite 56 olivine crystals 56 Sinosauropteryx 56 Homo antecessor 56 speleothems 56 VIDEO Egyptian mummies 56 skin ligaments tendons 56 martian meteorites 56 radiocarbon dated 56 Nanopores 56 mitochondrial genomes 56 Neanderthal genome sequence 56 archaeologists unearthed 55 archeopteryx 55 physicist Wilhelm Roentgen 55 mammal fossils 55 X ray fluorescence spectroscopy 55 Martian meteorites 55 inhaled fibers 55 Palaeontologists 55 preserved fossils 55 ancient hominid 55 Archaeologists uncover 55 bought Glaxo Serevent 55 dinosaur skulls 55 hadrosaur 55 Hadar Ethiopia 55 Puijila 55 Castorocauda 55 Qesem Cave 55 fossil specimens 55 Dr. Martin Rundkvist 55 Massospondylus 55 Frombork northern 55 hominoid 55 hominid skull 55 ostracods 55 species Ardipithecus ramidus 55 obscure Florentine merchant 55 feathered dinosaurs 55 Fossilised 55 conodonts 54 fossilized skeleton 54 Palaeontology 54 prehistoric crocodile 54 tyrannosaurids 54 scroll fragments 54 Herod tomb 54 hominid species 54 Cristina Chiappini 54 Repenomamus 54 prehistoric Qesem cave 54 dinosaur species 54 paleobiologists 54 skeletal fragments 54 Denisova Cave 54 Linhenykus 54 isotopic analysis 54 southern supercontinent 54 hominid fossils 54 journal Palaios 54 fossils 54 Ancient tomb 54 grizzlies roam 54 Sahelanthropus 54 Neanderthal genome 54 fossilized skeletons 54 Caucasian Stonehenge 54 palaeontologists 54 paleoanthropologists 54 Neanderthal skeletons 54 hyena dung 54 Ice Age bison 54 Otzi 54 flint tools 54 hand axes scrapers 54 Stegodon 54 pottery fragments 54 Woolly mammoth 54 Makovicky 54 Microraptor gui 54 Pindos 54 Pierolapithecus 54 Mossbauer spectrometer 54 Tarbosaurus 54 sauropod skulls 54 dromaeosaurid 54 historians anthropologists 54 Nicholas Conard 54 Inkayacu 54 crania 54 carbonate globules 54 lunar meteorites 53 Confuciusornis 53 T. rex skull 53 Neanderthal DNA 53 coprolite 53 mastodon tusk 53 molar tooth 53 vertebrate fossils 53 Repenomamus robustus 53 epiblast stem cells 53 Haast eagle 53 radiocarbon dates 53 Dig unearths 53 Mousterian 53 Fossilized bones 53 floresiensis 53 Hans Tropsch 53 peer reviewed Annals 53 horned dinosaur 53 Liang Bua 53 Ötzi 53 painted wooden sarcophagus 53 Morganucodon 53 duck billed hadrosaur 53 Louvre Museum Leonardo da 53 erectus skulls 53 cartonnage 53 SAQQARA Egypt Egyptian 53 tektites 53 ramidus 53 wooden sarcophagi 53 Paranthropus 53 Neanderthal fossil 53 Carbot 53 Argentinosaurus 53 Siberian mammoths 53 mummified dinosaur 53 Palaeolithic 53 Neanderthal skeleton 53 aurochs 53 PaleoAngola project 53 trap antimatter atoms 53 Crichton ankylosaur 53 hominid fossil 53 Guanlong wucaii 53 fossilized dinosaur eggs 53 Wilhelm Conrad Roentgen 53 Sinornithosaurus 53 Zivie 53 refrozen ice 53 Ice Age mammals 53 geoneutrinos 53 Nemicolopterus 53 ornithischians 52 Hans Larsson 52 Evolutionary Anthropology Leipzig 52 Asilisaurus 52 Gohar Tepe 52 geochemists 52 fossilized bones 52 Linheraptor 52 hominoids 52 ancient Phoenicians 52 Dromomeron 52 ancient Egyptian mummies 52 Neanderthals interbred 52 dwarf hippos 52 Psittacosaurus 52 Post VSE POST 52 long necked sauropod 52 hominin species 52 Nectocaris 52 Australopithecus africanus 52 crocodiles turtles 52 H. floresiensis 52 smallest exoplanet ever 52 Pääbo 52 archeologists 52 Jaekelopterus 52 archaeological expedition 52 fossilized dinosaur dung 52 Antikythera mechanism 52 PancakeCroc 52 theropod 52 osteologist 52 theropod dinosaur 52 extinct mammal 52 Falcarius 52 sterile neutrino 52 biologists geneticists 52 Giovanni Schiaparelli 52 upper molar 52 archeologists unearthed 52 HARPS instrument 52 hominid skulls 52 Neander Valley 52 fluid inclusions 52 Archeologists unearth 52 Istituto Nazionale di Astrofisica 52 Iguanodon 52 archaeologist Heinrich Schliemann 52 fossils unearthed 52 Zoque Indians 52 concretions 52 Ice Age mammal 52 melanosomes 52 eastern cougar subspecies 52 morphological traits common 52 Radiocarbon 52 Terrorist explosives 52 paleoenvironmental 52 Tianyulong 52 Skhul 52 skull fragments 52 Anchiornis huxleyi 52 fruitfly Drosophila 52 geochronology 52 Ventastega 52 Homo species 52 Molecular Biology Laboratory EMBL 52 Ionospheric Sounding 52 pharaonic tombs discovered 52 exquisitely preserved 52 steppe mammoth 52 Gigantopithecus 52 carnivorous sponge 52 malaria parasite genome 52 Neandertal DNA 52 assassin spiders 52 T. rex bone 52 Dakosaurus andiniensis 52 archaic ungulates 52 fossil hominids 52 Nimbadon 52 mastodon bones 52 Pottery shards 51 Radiocarbon dating 51 duckbilled dinosaur 51 Catrein declined 51 extracted mitochondrial DNA 51 scutes 51 mollusk shells 51 mammoth tusk 51 archaeologists 51 microbialites 51 Turiasaurus 51 mitochondrial DNA mtDNA 51 removed Tut mummy 51 juvenile Columbian mammoth 51 Raptorex kriegsteini 51 magnetite crystals 51 Hans Peter Uerpmann 51 carbon isotopes 51 Liang Bua cave 51 ARCHAEOLOGISTS 51 journal Behavioural Ecology 51 Herto 51 Middle Awash 51 oviraptors 51 Shanidar Cave 51 Middle Paleolithic 51 proprietary nanofabrication 51 stony meteorite 51 Mapusaurus 51 mummies unearthed 51 geology paleontology 51 torosaurus 51 past boninite lavas 51 pottery sherds 51 palaeontological 51 fossilized specimens 51 Saqqaq 51 mitochondrial genome 51 Eberhard Karls University 51 archeologists excavating 51 Neanderthals roamed 51 Dikika 51 Paleoanthropology 51 CNRS Institut 51 Soa Basin 51 Australopithecus genus 51 mtDNA sequences 51 Hadrocodium 51 Laetoli footprints 51 deepest darkest abyss 51 phytoliths 51 humans interbred 51 Archaeologist Petr Veleminsky 51 Geneticists 51 Falcarius utahensis 51 mitochondrial genome sequence 51 paleobotany 51 pigtail macaques 51 astronomers physicists 51 Milford Wolpoff 51 Protoceratops 51 paleoecology 51 hominid footprints 51 delights O'Dor 51 deCode genetics 51 sauropodomorphs 51 saber toothed vegetarian 51 AN Severtsov Institute 51 stegosaur 51 anamensis 51 Neandertals 51 dinosaur Sereno 51 Moya Sola 51 homo floresiensis 51 Madaba Map 51 smallest exoplanet 51 anthropoids 51 Australopithecines 51 ammonites 51 Helmholtz Zentrum Munchen 51 Plesiosaurs 51 prehistoric crocodiles 51 woolly rhino 51 journal Meteoritics 51 morphometrics 51 Dmanisi 51 Archaeopteryx 51 Excessive dioxin levels 51 dig unearths 51 sinornithomimus 51 Onthophagus 51 Vasari fresco 51 undersea volcanoes 51 Berlin Charite hospital 51 genomewide association study 51 crinoid 51 Sima de los 51 Koobi Fora 51 ribosomal RNA rRNA 51 Anchiornis 50 Daemonosaurus 50 necked plesiosaur 50 circular particle accelerator 50 embryo clones 50 stromatolites 50 Physikalisch Technische Bundesanstalt PTB 50 fossilized coral 50 Patagonian dinosaur appears 50 Neanderthal extinction 50 Giovanni Cassini 50 dubbed Angolatitan adamastor Angolatitan 50 nanosized 50 Sauropod 50 dinosaur genera 50 later Ettore Campogalliani 50 Microstructure Physics 50 meteorite fragments 50 CDMS experiment 50 fossilized dinosaur 50 megalodon shark 50 Antarctic meteorites 50 theropods 50 Upper Paleolithic 50 Laonastes 50 sauropod dinosaur 50 T. hallae skeletons 50 mammoth tusks 50 earliest tetrapods 50 Facility ESRF 50 potsherds 50 Maria Lauterbach Hudson 50 Mike Morwood 50 brachiopods 50 Oviraptor 50 Hohle Fels 50 extinct woolly mammoth 50 fossilized feces 50 FOLOTYN folate analogue 50 mitochondrial DNA sequences 50 moose antlers parachute 50 artefacts unearthed 50 Technische Universitaet Muenchen TUM 50 Cenozoic Era 50 sensitive pineal gland 50 Radiocarbon tests 50 siamang gibbons 50 degus 50 stone arrowheads 50 rocky extrasolar planet 50 Pharaonic tombs 50 Plateosaurus 50 chimp genomes 50 starch grains 50 mitochondrial DNA lineages 50 Chauvet Cave 50 ANI Archaeologists 50 Higgs boson particle 50 Triceratops skull 50 archaeologists unearth 50 Tenontosaurus 50 Ann Lucas Birle 50 terrestrial mammal 50 litho geochemical 50 Sumerian Babylonian 50 Hohle Fels cave 50 H. erectus 50 species Homo floresiensis 50 amphorae 50 Kay Bidle 50 lunar crust 50 Siberian permafrost 50 Lake Vostok 50 hadrosaurs 50 carbonaceous chondrite 50 Earthly contamination 50 steam eruptions 50 bacterium genome 50 microbiomes 50 Gran Sasso mountain 50 formalin fixed tissue 50 Ardipithecus ramidus 50 molecular phylogeny 50 lemur species 50 law lightly Garapon 50 archaeologists anthropologists 50 named Raptorex kriegsteini 50 sulfur isotopes 50 Eodromaeus fossils 50 Taung skull 50 Incan mummy 50 plesiosaur 50 Dakosaurus 50 journal Behavioral Ecology 50 Thracian tomb 50 diplodocus 50 dimming starlight 50 Senckenberg 50 Regenstrief Institute affiliated 50 ancient supercontinent 50 species Australopithecus afarensis 50 Ground penetrating radar 50 Wide Angle Search 50 successfully cloned Dolly 50 terracotta figurines 50 radiocarbon dating 50 carbonaceous meteorites 50 duckbill dinosaur 50 Physical Anthropology 50 Roman villa 50 robustus 50 hominin fossils 50 proprietary nanofabrication technology 50 biosignatures 50 Gran Dolina 50 room temperature colliders 50 Centers Helmholtz Gemeinschaft 50 cocaine abusers Kosten 50 overpaint 50 dinosaur mummies 50 Bone fragments 50 Herod funeral procession 50 Nima Arkani Hamed 50 Gravity Recovery 50 Blackburn Greider 50 enterotypes 50 biophysicists 50 microscopic single celled 50 T. hallae 50 fossils dating 50 genus homo 50 predatory dinosaurs 49 Christian Koeberl 49 paleontological discoveries 49 macaque genome 49 scientists 49 Roger Musson seismologist 49 herbivorous dinosaur 49 sediba 49 interstellar molecules 49 Higgs bosons 49 hominins 49 volcanic pumice 49 Messel Pit 49 supersymmetric particles 49 Dinosaur Discovered 49 radula 49 sphinx statues 49 Homo erectus evolved 49 hydrated minerals 49 Tawa hallae 49 primitive primate 49 Bartonella species 49 placental mammals 49 Helmholtz Centre 49 pottery utensils 49 Palaeozoic sedimentary 49 microfossil 49 reanalysed 49 lunar craters 49 bird Archaeopteryx 49 Lake Cheko 49 interactome 49 Florence convent 49 ichthyosaur 49 Cora Crippen 49 mummified corpse 49 Laetoli Tanzania 49 yeast genome 49 Hanny Voorwerp 49 Sea urchins 49 prehistoric mammals 49 AKRF firm 49 horned dinosaurs 49 Compsognathus 49 Talpiot tomb 49 PhysOrg reports 49 Argentavis 49 smallest exoplanets 49 X ray fluorescence spectrometry 49 Rattus norvegicus 49 Gorham Cave 49 graphene flake 49 Fossilized 49 BMC Biology 49 Radiometric dating 49 orbited Jupiter 49 archosaur 49 Magdeburg Cathedral 49 gliding mammals 49 zoological specimens 49 de la Recherche Médicale 49 spicule 49 mammal lineages 49 fossilized pollen 49 Max Planck Institut für 49 vestigial organs 49 macrofauna 49 Dinosaur fossils 49 radar interferometry 49 spectroscopic analysis 49 chondritic meteorites 49 Rosetta lander 49 Gerta Keller 49 placental mammal 49 human microbiome 49 prehuman 49 medullary bone 49 Acanthostega 49 Mesozoic mammal 49 fossilized shells 49 Tel Zayit 49 Radioastronomy 49 theropod dinosaurs 49 Georges Cuvier 49 maternal lineages 49 Hominid 49 homo erectus 49 microscopic crystals 49 Oliver Rauhut 49 Hebrew Aramaic 49 Fossil hunters 49 biologists biochemists 49 Ehud Netzer 49 King Tut mummy 49 chondrules 49 Jovian moon 49 Aphrodisias 49 preserved mummies 49 holotype 49 titanium zirconium 49 feathered dinosaur 49 Mesozoic mammals 49 Gawis 49 Geomyces destructans 49 crocodile fossils 49 Neolithic Age 49 oracle bones 49 mud volcanoes 49 fossilized remains 49 van Arkel discovery 49 herbarium specimens 49 Max Planck Institut fur 49 winged dinosaur 49 birdlike dinosaur 49 tetrapods evolved 49 Standing sentinel 49 astrobiologists 49 Pavel Kroupa 49 Vindija Cave 49 Mössbauer spectrometer 49 prehistoric reptile 49 fossilized 49 multicellular animals 49 A. africanus 49 superheavy element 49 archaeologists excavate 49 Appy Sluijs 49 thermophilum 49 supervolcanoes 49 hieroglyphs 49 built Dornier turboprop 49 phyllosilicate 49 necked dinosaur 49 Jakob Vinther 49 biomineralization 49 Columbian mammoths 49 Forensic entomology 49 endogenous retroviruses 49 infrared spectra 49 fossilized fragments 49 radiometric dating 49 Eske Willerslev 49 Taung child 49 insect larva 49 jawbone unearthed 49 homologies 49 mammoth skeleton 49 Juravenator 49 synchrotron x ray 49 Vesuvius eruption 49 Wilhelm Rontgen 49 Chladni 49 fossilized teeth 49 Egyptian hieroglyphs 49 named Gryposaurus monumentensis 49 superheavy elements 49 chalcogenides 49 martian rocks 49 Claudius Ptolemy 49 Atapuerca 49 Denisovans 49 Paisley Caves 49 fossilized insides 49 KamLAND 49 phylogeographic 49 Wenner Gren Foundation 49 sauropod 49 legless lizard 49 Microscopic examination 48 vertebrate animals 48 metazoan 48 Voynich manuscript 48 vast necropolis 48 molecular phylogenetic 48 choanoflagellates 48 Mayan ruler Pakal 48 Lauterbach charred corpse 48 Research INSERM 48 Gigantoraptor 48 Poinar 48 Flemish masters 48 primate lineage 48 Gassowski 48 pottery kilns 48 trilobite fossils 48 Archaeologists unearthed 48 zebra finch genome 48 Plaza Huincul Argentina 48 undiscovered particle 48 Max Plank 48 supertree 48 fossilized bone 48 paleontologists 48 stag moose 48 chondritic 48 Gryposaurus monumentensis 48 philosopher René Descartes 48 endocasts 48 experimentally demonstrated 48 Christopher Henshilwood 48 skeletons skulls 48 bonebed 48 Eadgyth 48 Avi Gopher 48 distant supernovae 48 Icadyptes 48 cnidarians 48 Dinosaur fossil 48 Joubert syndromes 48 eukaryote 48 Saqqara necropolis 48 Laetoli 48 mole rats 48 archaeo 48 Gavin Prideaux 48 Climate Experiment GRACE 48 speleologists 48 journal Palaeontology 48 subsurface ocean 48 sarcophaguses 48 serpents hissed 48 Phoenix Microscopy Electrochemistry 48 exo planet 48 tholins 48 unglazed clay 48 ankylosaur 48 anatomical specimens 48 planets atmospheres 48 Aurignacian 48 spherules 48 astronomer Tycho Brahe 48 precaution Wiehle 48 snail shells 48 Jørn Hurum 48 bones 48 Pollen grains 48 Baltic amber 48 igneous rocks 48 shadowy craters 48 Science Fund FWF 48 Hesperonychus 48 Wassonite 48 Karolinska Institutet Sweden 48 magma chambers 48 Helmholtz Zentrum München 48 Sahelanthropus tchadensis 48 ancient necropolis 48 called Abydosaurus mcintoshi 48 epigenetic modification 48 sub glacial lakes 48 carbon spherules 48 protozoans 48 Microraptor 48 albino alligators 48 osteology 48 Paleontologists 48 Nazca lines 48 Tiarajudens 48 apatosaurus 48 using multibeam sonar 48 pottery figurines 48 European Synchrotron Radiation 48 monotremes 48 bilaterians 48 Lahoun 48 lobe finned fish 48 PhysOrg.com Scientists 48 clefting 48 Using radiocarbon dating 48 Nasa Kepler 48 Prevotella 48 Rigorous scientific 48 Gamma ray burst 48 Hohle Fels Cave 48 Theropods 48 dinosaur bones 48 artificial spider silk 48 skull fragment 48 Xenopus embryos 48 neutrino oscillation 48 vertebrate paleontologist 48 sea scorpions 48 titanosaurs 48 proto Canaanite precursor 48 Lordkipanidze 48 fossilized feathers 48 Thomas Jessell 48 physicists chemists biologists 48 Ayelet Dayan 48 fragments 48 Observatoire de Paris 48 Diplodocus 48 Murchison meteorite 48 Comet C/# P1 McNaught 48 haplotype map 48 genetically mapped 48 evolutionary geneticist 48 zircon crystal 48 fossil primate 48 gastropod 48 postholes 48 prehistoric lizard 48 Jerzy Artymiak spokesman 48 ornately carved sarcophagus 48 Galilean satellites 48 Pharaoh Tutankhamen 48 King Tutankhamun tomb 48 therizinosaur 48 petrified tree trunks 48 mummified dinosaurs 48 Paranthropus boisei 48 dinosaur footprints 48 crinoids 48 Complexo Hospitalario Calde 48 Senckenberg Research Institute 48 Radiocarbon testing 48 skeleton unearthed 48 golden fronted bowerbird 48 pink iguana 48 Amihai Mazar professor 48 apelike ancestors 48 medullary bones 48 Ralf Gellert 48 Southern Observatory ESO 48 single celled organisms 48 sedimentary deposits 48 Fraunhofer Institutes 48 BCL6 gene 48 JILA joint 48 journal PloS ONE 48 sauropodomorph 48 turbidites 48 ancient Etruscan 48 volcanic basalt 48 Leishmania parasites 48 hominid skeleton 48 Connie Arzigian 48 faience 48 fatty acids amino acids 48 Gesher Benot 48 Max Delbruck Center 48 Klotho gene 48 university Karolinska Institutet 48 Georgi Kitov 48 Svante Paabo 48 fungi algae 48 trilobites 48 mummies 48 pronounced parietal 48 ancient Etruscans 48 flatfishes 48 known bird Archaeopteryx 48 Hatshepsut mummy 48 funerary mound 48 Yosef Garfinkel 48 Hair follicles 48 SN #C 48 Comparative Genomics 48 australopithecines 48 paleomagnetic 48 sedimentary layers 48 Indohyus 48 worm C. elegans 48 bronchial lavage 48 prehistoric cave 48 Sarah Werning 48 Fritz Haber Institute 48 planetary nebulas 48 humans Homo sapiens 48 noncoding RNAs 48 excavating cave 48 Simon Braddy 48 insects crustaceans 48 Galileo Galilei corpse 48 Laramidia 48 molecular geneticists 48 Felis silvestris 48 protoplanet 48 UFZ 48 Thutmose 48 Archaeopteryx fossil 48 microcephalin 48 genome rearrangements 48 otoliths 48 S. tchadensis 48 liverwort 48 Smaller colliders 48 COROT 7b 48 hominid 48 Long beaked Echidna 48 spectroscopic techniques 48 metamaterial structures 48 Frombork Cathedral 48 journal Ethology 48 fungal genomes 48 meteoritic material 48 synchrotron X ray 48 genetic determinants 48 Australopithecus sediba 48 Martian craters 48 Archeologists 48 uncle Dawoud 48 carbon isotope ratios 48 Avishay Gal Yam 48 Marten Hans 48 P. boisei 48 Ice Age fossils 48 Alu elements 48 phylogenies 48 worthwhile Schwehm 48 lunar soil 48 pottery jars 48 Pergamon Altar 48 Life SIX SLHN 48 papyri 48 pterosaur 48 quasicrystalline 48 astronomer Ptolemy 48 Puertasaurus 48 photographing handrails antennas 48 middens 48 Cees Dekker 47 jawbone fragment 47 FSIS microbiological sampling 47 Deinococcus 47 annelid worms 47 multi celled 47 radiocarbon 47 C. elegans worm 47 worm Caenorhabditis elegans 47 Brontomerus 47 Universitaet 47 Arabidopsis genome 47 dinosaur fossil 47 carnivorous dinosaurs 47 geophysics prospecting 47 Curtarolo 47 HISTORIC SITE Site 47 excavated 47 neutron diffraction 47 Rosetta Elucidator systems 47 Etruscan tomb 47 Vadim Backman professor 47 element osmium 47 colliders 47 Elwyn Simons 47 Neogene 47 mineral olivine 47 olivine rich 47 Sechin Bajo 47 funerary urn 47 herbivorous dinosaurs 47 sediment cores 47 scanning electron microscopes 47 Salk scientists 47 Imec performs world 47 Carla Vecchiotti 47 dinosaur fossils 47 Rabbi Loew 47 fossilized dung 47 CERN experiments 47 aragonite 47 chitons 47 tiny single celled 47 Annamite striped rabbit 47 underdrawing 47 Archaeologists unearth 47 jawbones 47 Dendrochronology 47 amphioxus 47 pigmented wax 47 Linda Elkins Tanton 47 bony ridges 47 prehistoric mastodon 47 Novarka 47 pottery shard 47 Elena Menotti 47 Homo habilis 47 headless skeletons 47 Higgs particle 47 metopes 47 nanohorns 47 giraffe necked 47 Amesbury Archer 47 KT boundary 47 CAIRO Egypt Archaeologists 47 legged meat eaters 47 bdelloid rotifers 47 stocky muscular 47 dromaeosaurs 47 Willerslev 47 isotopic signatures 47 mitochondrial Eve 47 mysterious Neolithic 47 Homo erectus fossils 47 saber tooth cat 47 Bronze Age civilization 47 chemist Leo Baekeland 47 prokaryotic 47 Darwinius