Despite the falsehoods that some politicians peddle, facts still matter, and getting those facts right is essential for survival. I know, because I regularly see the deadly consequences of getting facts wrong. ... When we glibly dismiss fact-checked articles in reputable news sources as “fake news,” we fail to use evidence to support our conclusions. In politics as in science, when we dismiss revealed truth, we increase the likelihood of catastrophically bad outcomes. By Daniel T. Blumstein.