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According to Jared Diamond, part of this was the development of complex, spoken language. He thinks it is responsible for a "great leap forward" about 60k year

• robotiamsowhat 10y ago
  From [1]: "Lake Toba is the site of a massive supervolcanic eruption estimated at VEI 8 that occurred 69,000 to 77,000 years ago, representing a climate-changing event. It is the largest known explosive eruption on Earth in the last 25 million years. According to the Toba catastrophe theory [2], it had global consequences for human populations; it killed most humans living at that time and is believed to have created a population bottleneck in central east Africa and India, which affects the genetic make up of the human worldwide population to the present." [1]: https://en.wikipedia.org/wiki/Lake_Toba https://en.wikipedia.org/wiki/Lake_Toba [2]: https://en.wikipedia.org/wiki/Toba_catastrophe_theory https://en.wikipedia.org/wiki/Toba_catastrophe_theory