An Ancient Supervolcano May Have Zapped the Ozone Layer, Exposing Early Humans to Intense Sunburns

The Toba super-eruption of some 74,000 years ago has long intrigued scientists, who remain uncertain about how the event affected humans living at the time. Now, a team of researchers suggest that the real damage from Toba came from on high, in the form of a depleted ozone layer induced by a massive release of sulfur...