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In 2006, multiple airline professionals — including pilots, ramp workers, and mechanics — claimed to have seen a UFO hovering over Gate C17 at Chicago's O'Hare Airport.

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In 1948, a U.S. National Guard pilot engaged in a 27-minute dogfight with a suspicious aircraft. It could've been an optical illusion, a Soviet weapon, or even an alien spaceship.

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The deep ocean is home to some of the strangest life forms that scientists have ever discovered. But from living fossils to mythical monsters, what else might be lurking in the Mariana Trench?

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Nearly 7 miles underwater, the Mariana Trench is the deepest point in all of Earth's oceans. Today, we'll meet some of the bizarre creatures who thrive in its freezing, pitch-black depths.

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After the spate of mysterious cattle mutilations in the 1970s, ranchers believed the government was responsible for the attacks and the subsequent cover-up. Others blamed satanic cults or extraterrestrial activity. The strange evidence leaves questions to this day.

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Throughout the 1970s and beyond, thousands of cows were found slaughtered in fields across the U.S. Their mutilations were precise, almost surgical, and many were accompanied by strange sightings in the days prior. To this day, the cases remain unsolved — but the evidence suggests foul play. The question is, by whom? 

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In 1947, a plane called the Star Dust went missing over the Andes mountain range in Argentina. The only clue to its disappearance was a mysterious phrase: STENDEC.

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As alchemists were persecuted over time, their teachings became the basis of myths and legends. But these stories had a darker purpose — to hide the secrets alchemists had discovered.

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What happened to the ancient alchemists and their writings? Over thousands of years, practitioners tried to turn metals into gold and obtain immortality. Instead, they developed a precursor to pharmacology and chemistry. But that may not be all… 

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After an experimental treatment helped sleeping sickness patients, doctors had new clues about the origin of the disease. But would they be able to stop a new outbreak?

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