Some 73,000 years back, the Mount Toba supervolcano in today’s Indonesia erupted, releasing the energy of the million a great deal of explosives. A lot ash and debris was injected in to the stratosphere it partly blocked the sunlight’s rays and triggered global temperature ranges to drop for a decade. Within this reserve, Donald R. Prothero presents the controversial argument which the Toba catastrophe nearly destroyed the human race, leaving no more than a thousand to ten thousand mating pairs of humans worldwide. Individual genes today present proof a “hereditary bottleneck,” an effect seen whenever a population of organisms turns into so little that their hereditary diversity is greatly reduced. This band of survivors could be the ancestors of all human beings alive today. Prothero explores the geological and biological evidence supporting the Toba bottleneck theory, disclosing the way the explosion itself was uncovered and offering insight into the way the world changed afterward and what might happen if such an eruption occurred today.