[John Valentine]

The eruption that created Lake Toba on Sumatra is estimated to have ejected over 2000 cubic kilometers of rock and ash.

[blam]

"The eruption that created Lake Toba on Sumatra is estimated to have ejected over 2000 cubic kilometers of rock and ash."

And, only 2,000 humans worldwide survived. Traces of that event are still visible in our genetic history.