http://www.newsweek.com/ancient-humans-clever-thought-1381788

When we look back over the course of human history, it is easy to marvel at the ingenuity behind simple but incredibly effective technologies—like houses, boats or bows and arrows—which had such a profound impact on the lives of our ancestors.

Many believe that such technologies are evidence of humans’ superior reasoning abilities. However, an experimental study published in the journal Nature Human Behavior suggests that ancient peoples did not necessarily have a sophisticated understanding of how these tools worked.