title: Concepts of length and distance in a study of Zulu youths.
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002657:Child Development; D003071:Cognition; D003210:Concept Formation; D004215:Distance Perception; D005006:Ethnicity; D006801:Humans; D007600:Judgment; D011582:Psychological Theory; D012424:Rural Population; D013019:South Africa; D013028:Space Perception; D014505:Urban Population