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<p> Ed Conway is an economics journalist and author of the book “Material World: The Six Raw Materials that Shape Modern Civilization.” <br><br>On today’s show, Ed reveals how three of those often-overlooked materials—iron, copper, and sand—shaped human advancement from the Renaissance to the Industrial Revolution to the digital age. And he talks about what they mean for our future.</p><p>See <a href="https://omnystudio.com/listener">omnystudio.com/listener</a> for privacy information.</p>