Terrorism is among the most volatile and unpredictable threats faced by the international community, with a wide array of non-state actors committed to carrying out widespread violence for political and ideological gain. But a soon-to-be published report by two leading experts outlines the potential for an even more deadly scenario on a scale that could threaten the existence of humanity as a species. Methods outlined in the report include those in which militants perpetrate or induce attacks involving biological weapons, nuclear exchanges, artificial superintelligence, and even the redirection of extraterrestrial objects. Zachary Kallenborn, co-author of "Existential Terrorism: Can Terrorists Destroy...