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The Stone Age was a broad prehistoric period during which stone was widely used to make tools with an edge, a point, or a percussion surface. The period lasted for roughly 3.4 million years,[1] and ended between 4,000 BCE and 2,000 BCE,[citation needed] with the advent of metalworking.
They operate, maintain or repair geothermal power plants and commercial and residential geothermal heating installations. (googled this for you)
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Du Bois believed that capitalism was a primary cause of racism, and he was generally sympathetic to socialist causes throughout his life. He was an ardent peace activist and advocated nuclear disarmament
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