- 2001: A Space Odyssey, 125
- Ache, 10
- Acheulean hand ax, 40–42
- Ackroyd, Peter, 16
- Ælfheah, 17
- Aiello, Leslie, 2, 3
- Albright, Jonathan, 119
- Alexa, 124
- Anglo-Saxons, 16–17, 46
- Apicella, Coren, 10
- Aral, Sinan, 91
- Arthur, Brian. See El Farol problem
- Artificial intelligence
- Axelrod, Robert, 6
- Bad Teacher, 34
- Bantu, 5
- Bayes, Thomas, 52
- Bayesian inference, 51–53, 61, 65, 68
- Beauty and the Beast, 47
- Beethoven’s Symphony no. 5 in C minor, 69
- Bering land bridge, 44
- Bollen, Johan, 95
- Boyd, Robert, 27
- Bowles, Samuel, 4
- Brain size, 3, 42. See also Social brain
- Brexit, 93–94
- Broesch, James, 83
- Burial practices, 21, 23, 62, 75
- Campbell, Joseph, 19
- Çatalhöyük (Turkey), 17, 18
- “Celtic Prince
- Chiasson, Daniel, 120
- Chiefdom, 64
- Childbirth, 2
- Chimpanzees, 91
- and dominance hierarchy, 82
- working memory of, 116
- Chinese whispers, 28, 36
- Christakis, Nicholas, 79, 90
- Christmas cards, 11. See also Dunbar, Robin
- Cities, 106
- fertility rates and, 106
- scaling laws and, 107
- Cladistics, 45. See also Evolutionary trees; Language, trees
- Clinton, Hillary, 94, 97, 102
- Clovis points, 44
- Collective behavior, 68–69, 99–102
- Columbus, Christopher, 71
- Connected, 90. See also Christakis, Nicholas; Fowler, James
- Consumer Electronics Show, 126
- Cooperation, 2, 9, 10, 32–33
- Copying, 4, 6
- Couzin, Ian, 8, 117
- Cownden, Daniel, 6
- CRISPR, 121
- Cristianini, Nello, 68, 100
- Cultural animal, xv
- Cultural attractors, 29–30, 32
- Cultural evolution, xvi, 36, 40, 109, 118
- Cultural intelligence, 9
- Cultural transmission, xvi, 24, 37, 68. See also Cultural evolution
- and population size, 105–109
- Culture, 9
- Currie, Thomas, 61, 63
- Dairy products, 20
- Darwin, Charles, 108
- Data faking, 112–113
- Dawkins, Richard, xiv
- DeepMind, 123. See also Google
- Dennett, Daniel, xiv
- de Sola, Derek, 112
- Directional agreement, 117
- Discount machine, 6
- Disney, Walt, 126
- DNA, 109
- Domesday Book, 16
- Dominance hierarchy. See Chimpanzees
- Dow Jones Industrial Average, 95, 98. See also High-frequency traders
- Drudge Report, 86
- Dunbar, Robin, 3
- Eagleman, David, 102
- El Farol problem, 98
- Emulation, 43. See also Imitation; Wilkins, Jayne
- Enron, 86, 88. See also Lay, Kenneth; Skilling, Jeffrey
- Esvelt, Kevin, 121
- Ethnographic Atlas, 57, 59, 61. See also Murdock, George P.
- Evans-Pritchard, E. E., 18–19
- Evolutionary trees, 45–50. See also Language, trees
- Facebook, xiii, 3, 36, 37, 85, 86
- Fake news, 86, 113, 119
- Female genital mutilation, 74
- Fertility rates, decline in, 74, 106–107 (see also Cities)
- Feuding, 22–24
- in Albania, 22, 24
- in Neolithic Europe, 22–23
- Flint blades, 43
- Flowers, Michael, 95
- Folktales, 19, 26, 30, 46–48
- treelike structure of, 47–48
- Fortunato, Laura, 60
- Fowler, James, 90
- Friedman, Thomas, 116, 120
- Future Shock, 109, 116
- Gibson, Mhairi, 60
- Gilligan’s Island, 104–106, 113
- GitHub, 120
- Goodall, Jane, 82
- Google, 53, 95, 101–102, 118, 122
- Google Scholar, 119
- Google Trends, 95, 96
- Graça da Silva, Sara, 47
- Granger causation, 96
- Greed, 30
- Gurmu, Eshetu, 60
- Hadrian’s Wall, 19
- Hadza, 10, 82
- Harappa (Pakistan), 20
- Henrich, Joseph, 8, 83, 105
- Henry IV, 12
- High-frequency traders, and stock market decline, 98–99
- Hildalgo, César, 49, 110
- Hill, Kim, 10
- Hill, Russell, 11
- Hillbilly Elegy. See Vance, J. D.
- H-index, 112
- Hobaiter, Catherine, 91
- Holden, Clare, 60. See also Bantu, expansion; Language, trees
- Homo erectus, 41
- Homophily, 90–92
- Horizons, xvi, 68–69, 73. See also Traditions
- Horst, Heather, 5–6
- Hrdy, Sarah, 4–5
- Hurricane Katrina, 70
- #IceBucketChallenge, 77
- Imitation, 43
- Industrial Revolution, 73
- Information, xvi, 6, 7, 8, 18, 32, 55, 83, 86, 88
- creation of, 52, 109–113 (see also Research papers)
- storage of, 108–109, 110
- Instagram, 3–4, 116
- Internet, 8, 40, 84
- iPhone, 40, 41
- Iterated learning, 53–54. See also Lewandowsky, Stephan
- Jobs, Steve, 126
- Ju/’hoansi, 10, 13, 14, 57
- Kalahari Desert, 10, 13
- Kathu Pan (South Africa), 43. See also Wilkins, Jayne
- Kermit the Frog, 85
- Kin selection, 33. See also Cooperation
- Kin terms, 13
- Kontakte, 87
- !Kung Bushmen. See Ju/’hoansi
- Laland, Kevin, 6
- Lampos, Vasileios, 102
- Landholding, systems of, 16
- Language, 27
- structure of, 30
- trees, 46, 58, 63
- Lapita people, 61–62
- Lawly Wurm, 96
- Lay, Kenneth, 86–87, 88
- Le, Quoc, 53
- Lewandowsky, Stephan, 63–64
- Lillicrap, Timothy, 6
- Linearbandkeramik, 18
- Little Red Riding Hood, 19, 30, 37, 47
- Lord of the Flies, 104
- Mace, Ruth, 60. See also Bantu, expansion; Language, trees
- Makse, Hernán, 86, 87
- Marriage, rates of decline in
- Marshall, Lorna, 13
- McDonald’s, 35
- Mechanical Turk, 121
- Memes, xiv
- Mesoudi, Alex, 7, 8
- Middle Stone Age, 44
- Miller, Daniel, 5–6
- MIT Media Lab. See Hidalgo, César
- Monty Python and the Holy Grail, 15–16
- Moore, Gordon, 110, 114
- Moore, Michael, 94
- Moore’s law. See Moore, Gordon
- Morone, Flaviano, 86, 87
- Munros, 69
- Muppets, 85
- Murdock, George P., 57–58
- Murphy, Walter, 69
- Naming, 12, 24, 118–119
- Neocortex, 3
- Neolithic, 18–22, 75
- Nettle, Daniel, 76
- Networks, 84, 87, 121. See also Social networks
- Neuroscience, 2
- Nicaraguan Sign Language (NSL), 27
- Normans, 16
- Nuer, 18–19
- Pentland, Alex, 12
- Perry, Katy, 85
- Pinker, Steven, 30
- Pollet, Thomas, 76
- Polynesia, ancient political systems of, 61, 63
- Population bottleneck, 37, 106
- Prediction, 93–99
- Presley, Elvis, 49, 125
- Prestige bias, 32
- Producers, 7. See also Scroungers
- Rajasthan (India), 26
- Random drift, 113, 119
- Red Queen effect, 112, 113
- Religion, and generosity, 33–34
- Research papers, growth in
- Richard II, 12
- Richerson, Peter, 27
- Rockefeller, John D., 77
- Ruck, Damian, 73–74, 78
- Rumpelstiltskin, 47
- Sarao, Navinder Singh, 99. See also High-frequency traders
- Schöneck-Kilianstädten (Germany), 23, 75
- Schroeder, Joseph, 29
- Scroungers, 7, 8
- Search algorithms, 118
- Sekara, Vedran, 92
- Selfish Gene, The, xiv
- Shroud of Turin, 1
- Silk, Joan, 82
- Silver, Nate, 94
- Skilling, Jeffrey, 86–87, 88
- Slacktivism, 77, 90
- Slosberg, Jason, 100
- Snapchat, 86
- Snow White, 26, 30
- Social brain, 3, 5, 32
- Social influence, 90. See also Homophily
- Social learning, 4, 6
- Social networks, 91
- dispersion of, 88
- embeddedness of, 87
- evolution of, 85
- and trade, 82–83
- Solé, Ricard, 48
- Stand by Me, 35
- Stapel, Diederick. See Data faking
- Sugar, 71
- and obesity, 72–73
- toxicity of, 72
- Talheim (Germany), 23
- Talhelm, Thomas, 8
- Tasmania, 105–106
- Teaching, 27
- Tehrani, Jamshid, 47
- Thera, 83
- Through the Looking Glass, 112
- Traditional knowledge, xvi. See also Traditions
- Traditions, xvi, 68–69
- dietary, 70–73 (see also Sugar)
- Transmission chains, 28, 53
- Trump, Donald, 94, 102
- Twitter, 68, 85, 86, 87, 95, 99, 113. See also Collective behavior
- Tybrind Vig (Denmark), 31
- Valverde, Sergei, 48
- Vance, J. D., 73
- Versatile Extra-Sensory Transducer, 102
- Vikings, 46
- Vindolanda, England, 19
- Vinyals, Oriyol, 53
- Vix, France, 21
- Wallace, Alfred, 108
- Watts, Duncan, 89
- Watts, Joseph, 65
- Weekend at Bernie’s, 51
- WEIRD societies, 8. See also Henrich, Joseph
- Wheeler, Peter, 2
- Wikipedia, 85
- Wilkins, Jayne, 43–44
- William the Conqueror, 16
- Willy the Orca, 115, 127
- Wisdom of individuals, 54. See also Lewandowsky, Stephan
- Wrangham, Richard, 3