Most of us serve as the first and perhaps only fact-checker of our own work. “Learning how to fact-check can help writers become better reporters,” Brooke Borel asserts in The Chicago Guide to Fact-Checking. Fact-checking is reporting in reverse, she says. You need to fact-check everything, even the thing you just checked last week, and even things you think you know are true, she insists. You also need to identify what’s missing, and whether that undermines the accuracy of your work. Borel tells how to check facts from a variety of sources, including analogies, product claims, press releases, and maps and atlases. She also offers tips on keeping good records of your sources.