For two decades, selftaught mathematician Henry E. Dudeney wrote a puzzle page, 'Perplexities,' for The Strand Magazine. Martin Gardner, longtime editor of Scientific American's mathematical...
Do you know a bit of English, and want to improve without a teacher? Whether you're a student, a traveller, or you just want to...
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For two decades, selftaught mathematician Henry E. Dudeney wrote a puzzle page, 'Perplexities,' for The Strand Magazine. Martin Gardner, longtime editor of Scientific American's mathematical...
