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.
View full size image. If you're listening to Katy Perry pop or The Red Hot Chili Peppers rock and have to raise your voice to be heard over the music, it's time to turn the volume down. Listening to loud music for too long can damage sensitive structures in the inner ear and lead to permanent hearing loss. Today, one in five American teens already have some hearing loss, according to a study in August 18 issue of the Journal of the American Medical Association.