If early humans crafted a hammer or an axe from metal for example. How on earth did they craft the first tool that was used to create that hammer or axe. I know you can create a hammer from natural material like stone and an axe from a sharp piece of stone but how did they forge the first metal tools and even weapons?
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Fire first, it all starts with fire (which is why no underwater civilizations).
Fire melts things, those things get poured into shapes in stone, then other stone is used to sharpen or bend metal.
Everything evolves from the prior.
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