How can we take stock in information in a world with "alternative facts"?

Only if you're really open to the possibility of being wrong can you ever learn, says researcher Alex Edmans. 

In an insightful lecture, he examines how the confirmation bias - the tendency to accept only information that supports one's own personal beliefs - can be misleading in social media, politics and beyond. And he offers three practical tools for finding evidence that you can actually trust.