00:00you have probably heard the phrase out of Africa before referring of course to humanity's
00:07predecessors leaving the continent and spreading across the globe while this is the de facto
00:12theory about our species diaspora there's still a question about why they left and experts have
00:17a new theory researchers have now identified volcanic glass from a super volcano that erupted
00:22around 74 000 years ago in the horn of africa an area of modern-day ethiopia they say this eruption
00:28could have led to drought conditions meaning the nomadic people that would have likely been
00:32following seasonal rivers may have created what they call a blue highway or what is essentially
00:37a path out of africa following these well-known water sources with the researchers writing quote
00:42seasonal rivers thus functioned as pumps that siphon populations out along the channels from one water
00:47hole to another potentially driving the most recent out of africa dispersal other recent studies have
00:53suggested that dry arid conditions were likely the reason for mankind's diaspora as well
00:5874 000 years ago earth was still very much in its last ice age meaning much of the planet's
01:03fresh water was frozen in glaciers and other massive collections of ice
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