A tool is an object that can extend an individual's ability to modify features of the surrounding environment or help them accomplish a particular task. Although many animals use simple tools, only human beings, whose use of stone tools dates back hundreds of millennia, have been observed using tools to make other tools. Read more on Wikipedia
The number of mentions of the word tool normalised by the total items over a 30 day interval.
Total number of mentions of the word tool over a 30 day interval.
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