Aura River in Turku, Finland (© Jarmo Piironen/Alamy)
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Aura River in Turku, Finland (© Jarmo Piironen/Alamy)
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Domestic donkey feeding on cherry twigs (© Juniors Bildarchiv GmbH/Alamy)
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In network protocol exchanges, it is often useful for one end of a communication to know whether the other end is in an intended