Pencils Puzzle (casse-tête)
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Temps de résolution pour ce puzzlePhotoWhen naturally occuring graphite was discovered, chemistry was in its infancy and the substance was thought to be a form of lead. Consequently, it was called plumbago (Latin for "lead ore") . The black core of pencils is still sometimes referred to as "lead," even though it never contained the element lead. Partager ce casse-tête | Puzzles récentsSam Colorful CompassVen Silver Fish SchoolJeu Girl Holding EternityMer Banana on BeachMar European RobinLun Yellow House FjordDim Maple Leaf Autumn Autres puzzles précédents | |
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