books.google.ca - Approximately 75,000 years ago, an event occurred that almost wiped out human life. According to a stunning new theory, this singular event may also have completely altered the genetic evolution of humankind. It was an event that released 3,000 times the energy of Mr. St. Helens. The new book, Supervolcano,...http://books.google.ca/books/about/Supervolcano.html?id=tSIa0VQn1NQC&utm_source=gb-gplus-shareSupervolcano
