contributing factor mentioned https://darwininamerica.wordpress.com/2014/09/29/the-control-of-fire-and-its-impact-on-human-evolution/ https://darwininamerica.wo

contributing factor mentioned https://darwininamerica.wordpress.com/2014/09/29/the-control-of-fire-and-its-impact-on-human-evolution/ https://darwininamerica.wordpress.com/2014/09/29/the-control... More useful calories to devote to awake activities such as communication, thought, planning and etc. mentioned in the article: >We should think of early human camps and bands as like a snail’s shell,” he says. Groups of humans may have shared simple shelters. A fire might have kept people warm and bugs away. Some group members could sleep while others kept watch.