Related by context. Frequent words. (Click for all words.) 41 Shostak 38 explorers 37 Charles Darwin 37 Susskind 35 prehistory 35 Feynman 35 Hawking 34 Judt 34 Pinker 34 Hitchens 34 Darwin theory 33 Behe 33 voyagers 33 Ishiguro 33 shipwreck 33 astrophysicist 33 expedition 33 voyages 33 voyage 32 Lévy 32 biblical scholars 32 Crichton 32 evolutionary theory 32 archeology 32 shipwrecks 31 astronomy 31 Squyres 31 cosmology 31 astronomer 31 Meriwether Lewis 30 astrophysics 30 historians 30 Northwest Passage 30 Gaskell 30 explorer 30 Nobel laureate 30 physicist 30 Ian McKellen 30 Mankiw 30 archaeologist 30 archeologist 30 theoretical physicist 29 Monbiot 29 Yudof 29 Kurzweil 29 Galton 29 mathematician 29 Higgs 29 ancients 29 explorations 29 evolutionist 29 expeditions 28 colonist 28 Peary 28 Singularity 28 geology 28 discoverer 28 Isaac Asimov 28 naturalists 28 Diamandis 28 quantum physics 27 uncharted 27 archaeological 27 discoverers 27 Native Americans 27 seafaring 27 archaeologists 27 anthropologists 27 Dawkins 27 Myhrvold 27 theoretical physics 27 general relativity 27 Stephen Hawking 27 Borucki 27 naturalist 27 adventurer 27 de Champlain 27 quantum theory 27 Physicist 27 Cerf 26 adventurers 26 Kaku 26 discoveries 26 archeological 26 Pliny 26 Randy Pausch 26 Ray Kurzweil 26 science fiction 26 palaeontologists 26 colonists 26 mariners 26 physics 26 Asimov 26 scientists 26 archeologists 26 Pratchett 26 Richard Dawkins 26 Francis Crick 25 Michael Crichton 25 Spanish conquistadors 25 forebears