The condition can be fatal if left untreated, but the tetanus vaccine and improvements in treatment mean deaths from tetanus are now very rare in the UK. In 2013, there were only seven recorded cases of tetanus in England and Wales, and no deaths.
Sound pressure is measured in decibels (dB). Like a temperature scale, the decibel scale goes below zero. The average person can hear sounds down to about 0 dB, the level of rustling leaves. Some people with very good hearing can hear sounds down to -15 dB. If a sound reaches 85 dB or stronger, it can cause permanent damage to your hearing. The amount of time you listen to a sound affects how much damage it will cause.
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.