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A wonderful and marvelous collection of answers to intriguing questions everyone ask about the world covering almost every subject, from science and history to art, language, mathematics, technology, and homeschooling

what is sudoku
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What Is Sudoku?

Sudoku is a logic-based, combinatorial number-placement puzzle. The objective is to fill a 9×9 grid with digits so that each column, each

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How Did Mahjong Get Its Name?

Mahjong is probably of 19th Century origin. It is a Western version of a Chinese game and is played with 136 to 144 pieces or tiles, similar

who first used keys
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Who First Used Keys?

The first known form of lock and key was used by the Assyrians in the Middle East about 4,000 years ago. This was revealed by the discovery