once saw on television a story about a man named Charlie Frank and his elephant Neeta. Frank raised Neeta from birth and trained her as a circus performer. On retirement he gave her to the San Diego Zoo. They had not seen each other for fifteen years at the point when the program filmed their reunion. Frank called to Neeta across a distance of about a hundred yards. She came to him immediately and performed her old routines on command. Her past experience gave her the power to recognize his voice. In a similar way, we human beings learn from experience alone how to recognize the color red,
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