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A still is a tool used to distill miscible liquids by heating and then cooling. Invented around the 10th century, it has been used to produce perfume and medicine and, most famously, to produce alcohol using fermented fruit juice.
Since alcohol boils at a lower temperature than water, the result is a strong alcoholic drink. Usually a still is made of copper, as it does not give taste to the drink, resists acid, and conducts heat.
See also: Distillation
Bas-Rhin département in France.