Talk:Air Nomads/@comment-24.59.27.66-20100809012840/@comment-3068994-20101127070222

I would say it is tied more to a few factors, such as birthing location/spirituality related to that area, a relation to genetics such that benders may only be born from a lineage of like benders, but this doesn't MAKE one a bender, and spiritual strength of said baby/new life.

There's a number of factors involved, and Mike/Bryan never rightly pinned it down themselves.