A human migration fueled by dung?
When people crossed from Asia to the Americas thousands of years ago, burning dung may have kept them warm.
By Emily Sohn, 00:00 AM August 11, 2003
If you think traveling to Alaska in the winter sounds cold today, imagine what it was like thousands of years ago.
Before the invention of central heating and hot cocoa, it would have been too cold for people to migrate to North America through the frigid tundra—without trees or firewood. Or so scientists thought.
Thousands of years ago, a 1,000-mile-wide grassland, forming the Bering Land Bridge (orange), connected Alaska and northeastern Russia. People traveled along this vast ...
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