What are the strangest unsolved mysteries in history?

These are some of the strangest unsolved mysteries in existence. What do you think is behind them?
This is a compilation video of many of the videos we publish. You can also watch each video individually.
00:05 - The Mystery of Havana Syndrome
06:17 - The Strange Bioduck Quack [Solved]
10:00 - The Mystery of the Mary Celeste
16:13 - The Mystery of Oak Island
20:26 - The Mystery of the Star that Shouldn’t Exist

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