[prmph]

Why is this effect not used to develop a device that converts normal sounds into such microwaves that the deaf can hear?

[krapp]

I would imagine the negative health effects caused by long-term exposure of the brain to microwaves strong enough to produce the desired effect might be a factor.

[gregshap]

Cochlear implants do perform a similar bypass

[https://en.m.wikipedia.org/wiki/Cochlear_implant]

[ObsoleteNerd]

Because of that minor (/s) side effect of brain damage?