Find the lighter Coin Puzzle

In front of you, there are 9 coins. They all look absolutely identical, but one of the coins is fake. However, you know that the fake coin is lighter than the rest, and in front of you is a balance scale. What is the least number of weightings you can use to find the counterfeit coin?




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There are two beautiful yet remote islands in the South Pacific. The Islanders born on one island always tell the truth, and the Islanders from the other island always lie.
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Can you guess what the third Islander will answer to the same question?

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In the 1920s, people feared that crossword puzzles would contribute to illiteracy.