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compressed air doing an impression of urgency, beloved by referees and lonely sailors alike

shepherd codeWelsh sheepdogs obey complex whistled commands at distance
whistled languageLa Gomera islanders converse across valleys by whistling
acme thundererThe classic pea whistle dates to 1884
physicsSound comes from air vibrating at a narrow edge
animal mimicrySome dolphins develop signature whistles like names
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