Does the kinetic energy of molecules make us feel a substance to be hot? I want to know the mechanism through which we feel something to be hot. How the molecules come in contact to our skin molecules and interact with them to send message to our brain through neurons? How the brain atoms interpret it as hot? and finally how this whole meat feel it to be hot? I want to know about this, for the sake of discussion going on, in Physics section and mainly in my way to understand humans as either just robots or something different. I don't have Bio-background, I would also like to know the fields which I should look for. Thank you.