The shape of the yin and yang sections of the symbol, actually gives you a sense of the continual movement of these two energies, yin to yang and yang to yin, causing everything to happen: just as things expand and contract, and temperature changes from hot to cold.
Sound is measured in units called decibels. Sounds of less than 75 decibels, even after long exposure, are unlikely to cause hearing loss. However, long or repeated exposure to sounds at or above 85 decibels can cause hearing loss. The louder the sound, the shorter the amount of time it takes for NIHL to happen.
(1) Now there is evidence that hearing loss creates its own neuronal changes in the brain that can be measured. (2) The study, from the University of Illinois, shows that hearing loss causes long-term changes in the brain structure of the estimated 50 million people in the US who suffer from it. Interestingly, those who have hearing loss and tinnitus do not seem to suffer the same changes as those with hearing loss alone.