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Re "Listen Up Before It's Too Late" [April 26]: It's easy to understand why custom fitting the earbud on headphones minimizes outside noise and therefore allows for reduced volume levels, which helps protect the user's hearing. But it's also disturbing to see so many people crossing streets without a clue as to what's going on around them. Music listeners should bear in mind: that outside "noise" may save your life!
Dick Hoffman, LA JOLLA, CALIF.
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