Academic researcher Dr. Glen MacPherson hosts a website documenting a Hum heard by people all over the world. The classic description is that it sounds like there is a truck idling outside your home. The sound is louder indoors than outdoors, and louder late at night than during the afternoon. In the more serious cases, the Hum can affect quality of life; in a number of documented instances, the torment of the noise has been life-altering. MacPherson will share the latest from his scientific investigation into the phenomenon, followed in the second half by open lines.