Amazon addresses the glaring weakness of noise-canceling headphones:

How to balance the benefit of noise cancellation with the danger of not hearing potential warning signs?

And the answer can be found in a new patent that Amazon received this month for “noise-canceling headphones that will allow critical, hand-picked words to be heard by the headphone-wearer.”  While not perfect solution, it’s a start.  Of course, the alternative solution is for government to regulate noise so that noise cancellation headphones are unnecessary, but that is sadly unlikely in our current political environment.

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