Related by context. Frequent words. (Click for all words.) 50 amphora 48 radiocarbon dating 47 Engelbart 47 camera obscura 46 orbiting Mars 46 ancient Greeks 46 archaeologists 46 Bronze Age 46 artefact 46 Xerox Palo Alto 45 Radiocarbon dating 45 Minoan 45 hieroglyphs 45 ancients 45 Galileo Galilei 45 ancient 45 Sumerians 45 ancient Greek 45 Etruscans 44 #BC [003] 44 hieroglyphics 44 Ancient Greek 44 sundials 44 codices 44 holography 44 ancient Egyptians 44 Byzantine era 44 sundial 44 Hubble Telescope 44 Step Pyramid 44 Ancient Egyptians 43 antiquity 43 Archimedes 43 Voyager spacecraft 43 cuneiform 43 Stonehenge 43 Ptolemaic 43 Buckminster Fuller 43 Antonio Stradivari 43 Leonardo da Vinci 42 plesiosaur 42 astronomical observatory 42 orbiting telescope 42 cryptographers 42 neolithic 42 Gravity Probe B 42 Sumerian 42 archeologists 42 Homo floresiensis 42 Seracini 42 Xerox PARC 42 Johannes Kepler 42 Ancient Greeks 42 archaeological finds 41 Frale 41 sextant 41 whale skeleton 41 Pythagoras 41 Alan Turing 41 Australopithecus afarensis 41 Oetzi 41 interplanetary spacecraft 41 classical antiquity 41 hieroglyphic 41 Babylonians 41 codex 41 papyrus 41 #BC [002] 41 Archeologists 40 astronomers 40 ENIAC 40 Egyptologists 40 artifact 40 ancient manuscripts 40 Extraterrestrial Intelligence 40 Copernicus 40 quantum entanglement 40 Hellenistic 40 Archaeologists 40 flint tools 40 Iron Age 40 invisibility cloaks 40 Egyptian pyramids 40 radiocarbon 40 Huygens 40 Turin Shroud 40 Rosetta stone 40 telescope 39 astronomical observations 39 Neolithic 39 Jules Verne novel 39 chronometer 39 fossilized bones 39 Jodrell Bank 39 Petrarch 39 NASA Cassini 39 fifteenth century 39 Rembrandt van Rijn 39 Edwin Hubble 38 Vinceti 38 archaeological