Scientists are only just beginning to understand the full extend of noise-induced hearing loss.
When they hear the music, some people want to dance. Other shoppers want to flee.
Unlike vision or touch, sound is much more difficult to control or avoid; music in particular spills across thresholds and intrudes into situations where it is unwelcome.
The author began hearing the sound at night, between the hours of 10 and 11 p.m.
'Street' via www.shutterstock.com
Shortly after Glen MacPherson started hearing strange humming noises, he created the World Hum and Database Project so people around the world could document their own experiences with the Hum.
Too much background noise has been linked to heart disease, strokes and even holding back children's learning.
Flaring at a gas well in Pennsylvania, where hydraulic fracturing has spread rapidly.
Higher hospitalization rates near unconventional wells could be linked to environmental and social stressors, such as noise and air pollution.
Run silent, run high.
Engine by Christian Lagerek/shutterstock.com
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