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TIL in the 1920s AT&T built a "telephone pole farm" in Chester Township, New Jersey to test different types of trees and protectant methods. It was also a training ground for technicians to practice climbing.

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pDg4 TIL in 2011 the Detroit Symphony Orchestra was in a deep financial crisis. Kid Rock, in what he called “the best drunk move I ever made,” decided to throw a benefit concert. He raised over one million dollars for the symphony and helped save classical music in Detroit.
R7knl TIL that Mount Sunflower, the highest natural point in the state of Kansas, is a site on the plains which is "virtually indistinguishable from the surrounding terrain."
9YWj6 TIL animals can't make vitamin D in their skin because their fur or feathers shade it from the sun. In the oils secreted on their fur or feathers are the precursors, and after vitamin D is produced they lick it up when grooming.
MBvb TIL in 2007, four AH-64 Apache helicopters were destroyed by mortar fire in Iraq because US soldiers took pictures of them landing at their base, and posted the pictures to the Internet. The pictures were geotagged, allowing insurgents to determine the exact location of the Apaches.
p8n98 TIL Paro Airport in Bhutan is so dangerous that only eight pilots are qualified enough to land there. (Pilots maneuver between mountains, fly within feet of houses, and land on a narrow, 6,500-foot runway.)