The beings who herded the sexes together for propagation at propitious times, when one half of the sex force was diverted to build the brain. The beings who taught humanity how the sexes could cooperate to produce a body at any time. The beings who are teaching humanity how to use the mind. Floods drove people out of the basins of the earth. Humanity lived in the basins of the earth and breathed by means of gill clefts.
Pioneers learn to function in the air in soul bodies.
Some pioneers developed lungs and began to live in the highlands.