![The Discovery Files show](https://d3dthqtvwic6y7.cloudfront.net/podcast-covers/000/014/590/small/the-discovery-files.jpg)
Summary: Engineers investigating "listener fatigue"--the discomfort and pain some people experience while using in-ear headphones, hearing aids, and other devices that seal the ear canal from external sound--have found not only what they believe is the cause, but also a potential solution.