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When Prof. Barry Hewlett was 23, he went on a grand tour, such as American students take after completing an undergraduate degree. Europe bored him and the Far East was too popular, so Hewlett decided to head to Africa. He flew to Amsterdam, hitched to Marseille and took a freighter to Algiers. He then crossed the Sahara Desert and reached the Congo River Basin, where the Aka people reside. Hewlett was...