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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 récentsDim Winter Solstice DeerSam Bear Hed HatVen Squirrel Falling SnowJeu Four Tin SoldiersMer White Tiger Jungle PoolMar Winter GlobeLun Cat Check Vortex Autres puzzles précédents | |
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