In 1947, Kenneth Arnold was flying his CallAir A-2 between Chehalis and Yakima, Washington, when he took a detour to search for a downed Marine Corps aircraft. There was a reward for anyone who could find the plane, and who couldn’t use $5,000? Arnold flew around searching for a while, and accidentally found something else—something much stranger than what he’d actually been looking for. As he watched, rapt, nine objects flew through the air in formation.

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