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ספרים בחינם

The Seven Follies of Science [2nd ed.] A popular account of the most famous scientific impossibilities and the attempts which have been made to solve them. To which is added a small budget of interesting paradoxes, illusions, and marvels

John Phin · 2011

ספרייה ציבורית, Project Gutenberg. בלי הרשמה.

Geometry -- Famous problemsScientific recreations