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The Controversial Sound Only 2% of People Can Hear

This "Hum" researcher has come up with the best explanation I have heard yet - the so-called "Hum" is strongly correlated with with buried gas and oil pipelines, and he demonstrates graphically the physics at play.

My point here in the context of this thread is that not all "hearing" is created equal.

There may be little variability in the bio-electrical-chemistry of the brain, but there is tremendous variability in the discipline of listening. Thats one reason why why one cartridge can sound genuinely great to 100 people but can sound just as genuinely awful to 20 others. 

Genetics, Brain, and Personality

"We also demonstrate how these research directions can be integrated using genetically informative designs in order to determine how genetic influences on personality are mediated by variability in brain structure and function."

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