that may be what you believe, but man is heart mind body and soul and that's not new information
I don't buy that there are "souls," but sure, humans are more than just their mental phenomena. Nevertheless, all mental phenomena, including all knowing, is brain phenomena.
nope, knowing is experience. the brain merely retains the information and can be used to process information to seek solutions. granted information as in reading and or being taught can help anticipate what to expect, but to know is to experience. follow the correct instructions gets correct results but to know is to experience the result, correct or not.
And experiencing/knowing is something that brains do.