Eric Walker added A Natural Work of Art May Be Hiding Among Indian Cave Masterpieces - The New York Times to a number of topics

Eric Walker added Prehistoric bone etchings believed to be among oldest evidence of human use of symbols to Middle Paleolithic and Origin of language

Eric Walker added Origin of language - Wikipedia to Origin of language

Eric Walker added a number of links to Origin of language, and added Origin of language to Language, languages, speech, writing, communication and meaning

Eric Walker added a number of topics and a number of links to Language, languages, speech, writing, communication and meaning, and added Language, languages, speech, writing, communication and meaning to Society