The 20 Most Important Tools Ever

David M. Ewalt~Forbes
From dawn to dusk, humans rely on tools to get us through the day. And from the beginning of civilization, we've used them to build and shape our world. In order to celebrate these devices, and so we might reflect upon the ways that we are the tools we use, decided to compile a list of the 20 most important tools of all time. These are the tools that have most impacted human civilization and helped move the course of history.
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I'm confused why the printing press isn't on this list.