Of all the things in Taos that make one go, Hmmm, perhaps the most elusive/mysterious/annoying/suspect/intriguing is the Taos Hum. Described as a low-frequency sound that resembles a diesel truck idling in the distance, the strange hum has been bewildering and maddening 2 percent of Taos’ population since the early ’90s. While many locations throughout the world report their own hum, the Taos Hum is most famous among hums due to a petition in 1993 begging congress to investigate its source. Congress delegated the task to top men ( Indiana Jones reference) to track down the source of the hum, but they came up empty-handed. Hum-hearers, of course, have many theories as to the what, where, when, why and how of the hum, including, but certainly not limited to, super-secret military operations, undetected seismic activity, the sound of the Earth’s core, human skin detecting sound, communications from lost spirits or living rocks, and—because it wouldn’t be a New Mexican mystery without it—alien activity. Whether it’s a government cover-up or a natural phenomenon, the Taos Hum (and Hum-hearers) remains a real humdinger. (Maren Tarro)