What new skill did people develop to help them survive in the new ston age?

They learned how to farm, sew clothes using animal hides, hunt, shelter, make more complex tools and found new uses for them, pottery, tame dogs, build canoes, and control fire.

Explanation:

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du boi was considered a radical because he wanted the immediate end for segregation. the biggest different between him and booker t. washington is that, even though washington believed that segregation should be considered illegal, he did not believe at all that a law was needed to keep blacks away from whites and that this would be something natural (to have the races apart) for a long time until society adjusted, while du boi believe that agitation was the only way to end segregation.