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Human Prehistory 101 Part 2: Weathering The Storm : Third in a series of videos that introduces human prehistory, this video describes how early humans continued to defy the odds and populated the Americas during the last ice age.
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- 20,000 years ago, the world suffered in the depths of the last ice age.
- For several thousand years,
- global average temperatures stayed 15 degrees Fahrenheit,
- that's about 8 degrees celcius below what they're today,
- and mile thick glaciers covered much of North America, Europe, and Asia;
- outside the ice-covered regions, it was so dry that survival became difficult in most areas.
- Some areas where people'd been living became inhospitable,
- and in some other places, new barriers of ice or desert separated groups of people,
- but against all odds, some people found ways to survive in severe conditions as far north as Siberia.
- The ice age not only created barriers, it also created bridges
- with so much water locked up in ice, sea levels dropped,
- exposing land and connected Siberia and Alaska,
- a few people in Siberia took advantage of this bridge,
- moving into present-day Alaska, and later, down into other parts of North America,
- maybe they followed migrating herds
- or maybe, they traveled in small boats, down the Pacific coast,
- or maybe they did both.
- No matter how they got there,
- those people who get there became the ancestors of today's Americans.
- In just a short time, humans from a small corner of Africa had populated all continents
- except Antarctica,
- and in there new homes, their languages began to differentiate to form the precursors of today's languages.
- Some populations probably didn't survived the ice age
- and those that did often became more isolated from other groups,
- scattered around the world, these small populations
- became more being culturally, and genetically distinct from one another.
- How would cultural innovations helped a few of these groups
- to expand dramatically over the next several thousands years.
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