The first tools man used would have simply been naturally found to do a job at hand, but they no doubt early on would have discovered that one worked better than another, thus the invention of the stone test: You pick something up, hit it hard against something else and eventually one of them breaks. The one that did not break was better, so it passed the stone test and you kept it until you found a better one. And so to make a long story short, after the discovery of fire and a few other optional downloads, that is how we have ended up with iphones and why diamonds are so expensive.


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