Tiny ‘hearing’ device is 100,000 times thinner than your eardrum
 

Finding long-range, low-powered sensors for wearable devices is the next scientific frontier. Researchers at Case Western Reserve University are working on atomically thin transducer "drumheads" that can send and receive signals at radio frequencies...

https://www.engadget.com/2018/04/02/...inner-eardrum/