Nuclear Energy, Space and Humanity's Future | Robert Zubrin | The Human Progress Podcast Ep. 30
The Human Progress Podcast
The Evolution of Humanity
Once people access higher temperatures in their kilns it became possible to smell iron, and iron is present in the Earth's crust on average at 100,000 parts per million. Once you have this, then all of a sudden the supplies of metals available to humanity increased literally 1000 fold. And there's an extraordinary transformation in civilization as iron and steel tools become available to the masses of humanity. It's only the heroes, the kings who are fully armored and who really matter on the battlefield.
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