> I believe it's fundamentally impossible to test for consciousness. You can't know if it feels like something to be any other thing but yourself.

I used to believe that too, but it turns out that consciousness can interact with consciousness.

E.g. find someone you love and trust, sit facing each other, hold hands, stare into each other's eyes, and breath in synchrony. For some cases nothing really happens in other cases... shared subjective experience.

> The domain of scientific knowledge is completely cut off from subjective experience.

Shared subjective experience is still subjective.