One way to combat mis-information and dis-information is to reinforce good information with patiently explained evidence. But according to Ilana Redstone, the deeper problem is that people are unduly certain. Indeed, certainty is a trap that encourages people to defend a contentious claim as if it were a fortress. As a result, contending sides barely listen to each other and polarization undermines civil discourse. Redstone offers some suggestions for loosening the hold of this trap. [This story originally appeared in Tablet Magazine, at tabletmag.com, and is reprinted with permission.}