Congrats go out again to Kathy White for correctly answering the questions to the contest. Semaphore has been used for relaying visual instructions to engineers since the 1840s and are still used today in the form of lights. Flag semaphores are used on aircraft carrier flight decks and you also see them at airports when when they guide an aircraft into and away from the terminal with the use of flashlights.
Kathy's fabulous prize will be hand delivered while we are visiting family and friends back home.
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