As this book goes to publication, Kabul is falling to steely-eyed pre-Enlightenment warlords. Washington D.C., having already fallen to feckless post-Enlightenment warriors of a different sort, has shown itself clueless about how to respond when pre-Enlightenment reality smacks it upside the face. Whether the hordes at the gates are at one place pre-Enlightenment or another post-Enlightenment, a crisis of civilization has been brought to a head by the elections of 2016 and 2020. Good To Know But Not To Use argues for a rediscovery of forgotten Enlightenment principles at this historical juncture.