Topic: unsolved mysteries
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Videos
Weird Lights in the Sky Appear Once Again Over San Francisco
What is causing these glowing orbs over the Mission District?
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Urban Wonk
Why Aren't Cities Littered With Dead Pigeons?
A wildlife expert and Smithsonian scientist help solve one of life's enduring urban mysteries.
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Photos
The Imaginary Monsters of U.S. Cities
Sure, the sticks have Sasquatch and the Jackalope. But what creepy cryptids lurk in thriving American cities?
