Related by context. Frequent words. (Click for all words.) 47 Late Cretaceous 44 Fertile Crescent 44 Little Ice Age 43 glaciation 42 Cretaceous Period 42 Inca empire 42 Sumerians 42 Incas 40 millennia 40 Homo sapiens 40 lineages 40 millenniums 40 hunter gatherers 39 Medieval Warm Period 39 Etruscans 38 Anasazi 38 Oetzi 38 mass extinctions 38 wildness 37 multicellular organisms 37 millenia 37 Mesoamerica 37 ancients 36 Neandertals 36 prehistory 35 hominids 35 #BC [003] 35 Ming Dynasty #-# 35 ancient Romans 35 Ancient Egyptians 35 caliphs 35 ancient Babylon 35 autumns 34 dinosaurs roamed 34 interglacial 34 ancient civilizations 34 Roman legions 34 Byzantine era 34 #AD [002] 33 prehistoric 33 Iron Age 33 ancient civilization 33 AD# [001] 33 centuries 33 Bronze Age 33 Mesopotamia 33 Babylonians 33 Neanderthals 33 Middle Ages 33 fifteenth century 33 eons 32 radiocarbon dating 32 clouds parted 32 Mayan civilization 32 Canaanites 32 ancient Egyptians 32 barrenness 32 Ancient Greeks 32 #th century 32 ancient Israelites 32 Canaanite 32 #BC [002] 32 Paleolithic 32 Centuries 32 Neolithic 32 preindustrial 31 monotheism 31 Persian Empire 31 twentieth century 31 Assyria 31 Mesoamerican 31 ancient Greeks 31 Babylonia 31 Byzantines 31 domestication 31 fourteenth century 31 pharaohs 30 ancient Mesopotamia 30 Holocene 30 Gnosticism 30 antiquity 30 cuneiform 30 persisted 30 ancient 30 civilization 30 primordial soup 30 primeval 30 eighteenth century 30 Staked 30 Phoenicians 30 thirteenth century 30 mystics 30 Hellenistic 30 glacial 30 lushness 29 polytheistic 29 Byzantine Empire 29 Roman empire 29 onset 29 aeons 29 Roman Empire