Understanding what consciousness is, and why and how it evolved, is perhaps the greatest mystery known to science.

Click here to subscribe to The Economist on YouTube: http://econ.trib.al/rWl91R7

Check out Economist Films: http://films.economist.com/
Check out The Economist’s full video catalogue: http://econ.st/20IehQk
Like The Economist on Facebook:   / theeconomist  
Follow The Economist on Twitter:   / theeconomist  
Read our Tumblr:   / theeconomist  
Follow us on Instagram:   / theeconomist  
Check out our Pinterest:   / theeconomist  
Follow us on LINE: http://econ.st/1WXkOo6