At the ANS Annual Meeting in Chicago held June 24–28, I attended the “President’s Special Session on Low Level Radiation and Its Implications for Fukushima Recovery,” and also the follow-on panel “Health Effects of Low-Level Radiation.” The two sessions together could well have been subtitled “The Tragedy of LNT.” In case you’ve forgotten, LNT stands for “Linear No Threshold”—the popular misconception that radiation risk is proportional to dose all the way down to zero.