I spent a while earlier today thinking about fingerprints, courtesy of Heather McDougal—courtesy of both her own rumination on the subject, which considers various aspects of the whys and wherefores of fingerprints (such as why we have them in the first place, and how they work), and of a 2002 New Yorker article raising questions about the forensic use of fingerprints. They’re very different articles, obviously, but both are quite interesting; check them out.