The practice of using a Y-shaped stick or rod to locate underground water, minerals, or other hidden things.
From 'dowse,' a verb with unclear origin that became popularized in mining communities during the 16th-17th centuries in Europe.
Dowsing has been used for centuries and even appears in medieval manuscripts, yet controlled studies show it works no better than chance—it's a fascinating example of something that seems plausible but doesn't hold up scientifically.
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