Fire
Clothing
Wheel
Lever (Archimedes)
Phonetic Alphabet
Sword
Print
Electric Telegraph (precursor to telephone)
Electric Light
Radio/Television
* In a letter from Marshall McLuhan to Cathy Willis, Assistant Editor of the book of lists, The People's Almanac (1976), responding to a request. McLuhan concluded with a note saying that it is hard for him to limit human extensions to 10.
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