Tagy: alien, aliens, alien-life, alien-lifeform, alien-lifeforms, the-great-filter, great-filter, filter, fermi, fermi-paradox, space, space-travel, doom, apocalypse, nuclear-war, nano-technology, genetic-engineering, crisper, climate-change, global-warming, human-origins, ai, evolution, science, kurzgesagt, in-a-nutshell