that enough water collected to support farming,
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It’s also possible that Angkor Wat’s spiral structures held special spiritual meaning for Khmer people and had no practical use,
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. Yet Fletcher says that nothing resembling these coiled forms appears in Hindu writings and art,
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.
After what must have been several decades of construction coinciding with work on the temple,
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, “the spirals may never have been completed and might never have become operational,
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,” Evans says.
Researchers are now examining fossilized pollen recovered from the coils for signs of cultivation or gardening,
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.
Buried towers
Another surprising discovery at Angkor Wat comes not from lidar but from ground-penetrating radar. While lidar reveals characteristics of the ground’s surface covered by vegetation,
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, ground-penetrating radar can detect objects buried deep under several dozen meters or more of soil.
In December 2009,
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, a team led by archaeologist Till Sonnemann of Leiden University in the Netherlands dragged a wheeled device reminiscent of a lawn mower over Angkor Wat’s vast outer section for two weeks. High-frequency radio waves emitted by the contraption bounced off buried objects, signaling

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