The Leaning Tower of Pisa, or simply, the Tower of Pisa, is the campanile, or freestanding bell tower, of Pisa Cathedral. It is known for its nearly four-degree lean, the result of an unstable foundation. The team examined the Leaning Tower of Pisa and found that surprisingly the very soil that caused the tower to tilt in the first place is what has kept it firmly in place all these years. The results found that something called dynamic soil-structure interaction allows the tower to stay upright.
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