Atavistical reversion may reach back to the very beginning of humanity, and some qualities of the first Great Mother may appear in the child of today.

The outgoing Board of Governors shall designate for membership on the Board the ten members most advanced in the technology of atomic energy including the production of source materials, […]

For quotations using this term, see Citations:St. Petersburgh.

Many rhabditids are able to form a third stage resistant juvenile (dauer) which also may serve as an infective stage.