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The more I write (or rather type), the more I'm beginning to understand how crucial for human evolution it has been to be able to write. Therefore, I'll go with any tools that have allowed us to write, and therefore, manifest our ideas into physical form, and keep a record of basically anything that comes to mind. So such a tool includes, a stone, to pen and paper, to typewriter, to computers and smartphones. Plus these same tools allow us to draw as well which has unlocked another part of our ever evolving brains.