Vows of silence and humanist beliefs led European clerics to create new communication methods for the deaf 500 years ago. Charles-Michel de L'Épée teaching the hearing impaired in his Paris institute.
Hominin reliance on Oldowan stone tools—which appear from 2.5 mya and are believed to have been socially transmitted—has been hypothesized to have led to the evolution of teaching and language. Here ...
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