Slavery was abolished in the U.S. in 1865, and is no longer legal anywhere in the world. So it comes as a shock to learn that, worldwide, some 28 million people are currently held in forced labor, ...
Bio-based building materials used to be mainstream. The roof of the Pentagon (which was built in the early 1940s) is insulated with horsehair. Until the mid-20th century, the great majority of ...
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