The Prehistoric Snap That Erased 90% Of Men (And Men Only)

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Here we go, from Wiki . . .

The Toba eruption (also called the Toba supereruption and the Youngest Toba eruption) was a supervolcanic eruption that occurred around 74,000 years ago, during the Late Pleistocene,[2] at the site of present-day Lake Toba, in Sumatra, Indonesia.

. . . The Toba catastrophe theory holds that the eruption caused a severe global volcanic winter of six to ten years and contributed to a 1,000-year-long cooling episode, resulting in a genetic bottleneck in humans.

Explanation: It also made the entire world smell like rotten eggs, from the sulphur gas emitted, for ten years straight.

Personal Disclosure: Ugh, imagine that eh!