Much attention has been focused on control of fire in human evolution and the impact of cooking on anatomy, social, and residential arrangements. However, little is known about what transpired when firelight extended the day, creating effective time for social activities that did not conflict with productive time for subsistence activities. Comparison of 174 day and nighttime conversations among the Ju/'hoan (!Kung) Bushmen of southern Africa, supplemented by 68 translated texts, suggests that day talk centers on economic matters and gossip to regulate social relations. Night activities steer away from tensions of the day to singing, dancing, religious ceremonies, and enthralling stories, often about known people. Such stories describe the workings of entire institutions in a small-scale society with little formal teaching. Night talk plays an important role in evoking higher orders of theory of mind via the imagination, conveying attributes of people in broad networks (virtual communities), and transmitting the "big picture" of cultural institutions that generate regularity of behavior, cooperation, and trust at the regional level. Findings from the Ju/'hoan are compared with other hunter-gatherer societies and related to the widespread human use of firelight for intimate conversation and our appetite for evening stories. The question is raised as to what happens when economically unproductive firelit time is turned to productive time by artificial lighting.Our old people long ago had a government, and it was an ember from the fire where we last lived which we used to light the fire at the new place we were going. . . Di//xao = Oma, 1998 (1) C ontrol of fire had an enormous impact on the life of our hominin ancestors. As Wrangham and Carmody have so cogently argued, the use of fire for cooking greatly increased the digestibility of food and effective provisioning of young, allowing for shorter birth intervals (2-4). Fire altered anatomy, particularly brain size and gut volume, and radically reduced chewing time. Fire protected early humans from predators and provided a new context for social interaction when food was brought to a central site for cooking. Modified landscapes after burning (5) and higher caloric returns from cooked foods lowered the costs of foraged foods, and thus the costs of sharing. Finally, artificial firelight altered circadian rhythms and extended the day (6), freeing time for social interaction that did not conflict with time for subsistence work.Current archaeological evidence indicates that our ancestors had sporadic control of fire by 1 million y ago or longer (7,8) and regular use after approximately 400,000 ka (9). With or following the control of fire, many developments were unfolding that rendered modern humans "unique" (10): extended cooperative breeding (11-13), higher orders of theory of mind (14, 15), religion (16), language (17, 18), social learning and cultural transmission (19,20), cultural institutions and their regulation (21,22), and intergroup cooperation and exchange (...