An important point that I think needs to be stressed is that determining if something is designed involves observing and testing the methods and practices.
For example, in the case of stone tools scientists observe knapping practices, even perform knapping, to see exactly what are the characteristics of a hand made stone tool as opposed to a natural occurring rock or chip.
It is this step, actually observing how the designer created the artifact that is missing in the IDM.
Anyone so limited that they can only spell a word one way is severely handicapped!
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