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The way [in / on] which we listen to music and hear sounds has changed over the centuries. Today, we have state-of-the [art / arts] , noise-cancelling ear buds that provide the highest quality [oral / aural] experience. In the near future, we will be able to listen to music [on / in] public without headphones. New technology is [being / been] that can aim [beam / beams] of sound at individuals, without people next to them hearing. This means we could be having private conversations in public without others listening [up / in] . A team of researchers at Penn State University in the USA developed an [innovative / innovation] called "audio enclaves". The ultrasound [waves / tides] used for these enclaves cannot be heard en route to the [recipient / incipient] . In addition, the waves can be bent to get around obstacles.

The researchers spoke to the website "The Conversation" about their work. [Lead / Steel] researcher Jiaxin Zhong said: "We [essential / essentially] created a virtual headset. Someone within an [edible / audible] enclave can hear something [meant / meaning] only for them, enabling sound and quiet zones." He elaborated on the [potent / potential] uses of the technology. Museums could provide headphone-free audio guides to visitors. Passengers in a car could listen to music without [distraction / distracting] the driver. Those requiring confidentiality could set up enclaves to [ensure / insure] their conversations are not overheard. Individuals could also receive personalized [ads / aids] as they walk through a shopping mall. In addition, audio enclaves could be set [up / down] to eliminate noise pollution in [busily / busy] workplaces.