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The
in which we listen to music and hear sounds has changed over the
. Today, we have state-of-the-
, noise-cancelling ear buds that provide the highest quality
experience. In the near future, we will be able to listen to music in public without headphones. New
is being tested that can aim beams of sound at
, without people next to them hearing. This means we could be having private conversations in public without others listening in. A
of researchers at Penn State University in the USA developed an
called "audio enclaves". The ultrasound
used for these enclaves cannot be heard en route to the recipient. In addition, the waves can be bent to get around
.