Pull up a map of Sumatra. Zoom in on the big lake in the northern third of the island.... https://en.wikipedia.org/wiki/Toba_catastrophe_theory https://en.wik

Pull up a map of Sumatra. Zoom in on the big lake in the northern third of the island.... https://en.wikipedia.org/wiki/Toba_catastrophe_theory https://en.wikipedia.org/wiki/Toba_catastrophe_theory