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Title : "Drought Reveals Giant, 4,500-Year-Old Irish Henge."
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"Drought Reveals Giant, 4,500-Year-Old Irish Henge."

"The circular structure in the Boyne Valley was discovered by drone photographers searching for signs of hidden Neolithic sites" (Smithsonian).

So why do these ancient structures stand out during times of drought? The henges are actually a series of concentric circles created by placing large posts in the ground. When the henge fell out of disuse or was burned down, the underground portions of the posts rotted away, changing the composition of the soil in the posthole, causing it to retain more moisture. During a drought, while the surrounding crops yellow, the plants over the post holes have a slight advantage. “The weather is 95 percent responsible for this find,” Murphy tells Best. “The flying of the drone, knowledge of the area, and fluke make up the rest in this discovery.”

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