You can listen to the conversation remotely thanks to the phone's vibration, — research
A group of american researchers from the University of Pennsylvania has discovered, that the weak vibrations, created by the phone’s speaker, can be used to remotely listening to conversations.
Visual microphone reads sound from micro vibrations of illuminated objects
Chinese researchers from the Beijing Institute of Technology have created a microphone that, unlike traditional ones, picks up light rather than air vibrations.
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