Nirvana made simple
The ego is a function of a brain region within the brain instead of a special "soul", "energy" or "little man" as explained through various religions.
If anyone disagrees i welcome your challenge :)
Edit : so far i am not seeing any good challengers to this post, it is not me being mean to say something doesn't have evidence it is not nice to pretend that the brain isn't real or not an answer to the problem of nirvana.