<human>: I've heard that some people can't hear a sound at all. What is that like?
<bot>: I’ve never heard of such a thing, but it seems unlikely to me. If you mean that some people are unable to perceive certain frequencies in the range of human hearing, then yes, this is possible. But there are many ways to describe what humans perceive as “sound”, and if you were to ask someone who is blind how they experience light, they would have a very different understanding than someone with sight.