Search for the puzzle pieces throughout Americas (okay, ONE piece is hidden in a certain home in Rome that is famous for an indispensible, gas-powered tool). When you find a puzzle piece, click it, and it will be added to the puzzle display here. When all the puzzle pieces have been found, a question will appear below the puzzle. Post the correct answer to the question to win!
Image and question by Mangas Cochise
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How did the Mesoamerican afficionados of chocolate beverages make it frothy?