Why this word is great
ISOPOINT — [Noun] The most recent moment in a population’s past when every individual alive was either ancestor to all living today or ancestor to none. From the Greek iso- ("equal") and point ("a specific moment in time"). Unlike "most recent common ancestor" (a single forebear from whom all descend) or "genealogical bottleneck" (a narrowing of genetic diversity), the isopoint is a temporal threshold, a silent hour when lineage resolves into two stark fates: oblivion or ubiquity. It is the last second before the river of ancestry splits into delta or desert, the final breath before a name vanishes or becomes universal, the quiet mathematical instant when every living thing stands either at the root of all futures or at the end of a branch with no new leaves—a reminder that time, not blood, is the true arbiter of legacy.