Evolutionary biologists believe sociability drove the evolution of our complex brains. Fossil evidence shows that as far back as 130,000 years ago, it was not (a) unusual for Homo sapiens to travel more than a hundred and fifty miles to trade, share food and, no doubt, gossip. Unlike the Neanderthals, their social groups extended far beyond their own families. Remembering all those (b) connections, who was related to whom, and where they lived required considerable processing power.
It also required wayfinding savvy. Imagine trying to (c) maintain a social network across tens or hundreds of square miles of Palaeolithic wilderness. You couldn’t send a text message to your friends to find out where they were ― you had to go out and visit them, remember where you last saw them or imagine where they might have gone. To do this, you needed navigation skills, spatial awareness, a sense of direction, the ability to store maps of the landscape in your mind and the motivation to travel around. Canadian anthropologist Ariane Burke believes that our ancestors (d) developed all these attributes while trying to keep in touch with their neighbours. Eventually, our brains became primed for wayfinding. Meanwhile the Neanderthals, who didn’t travel as far, never fostered a spatial skill set; despite being sophisticated hunters, well adapted to the cold and able to see in the dark, they went extinct. In the prehistoric badlands, nothing was more (e) useless than a circle of friends.
* savvy: 요령, 지식
** Palaeolithic: 구석기 시대의