This book was so well written on a subject I knew absolutely nothing about, but was riveted to every fact he presented so well as a true knowledge bearer. A page turner from start to finish and also most a text book, factual presentation of what we all need to be aware of, and act with due diligence to do our part in preparation beyond our local natural disasters. Scary as hell and begs the question, why isn’t our government taking steps against this very real threat to protect us all? Loved every page! Hated that it could actually happen!