NYC streets in the 1860s were filthy, bumpy, and fiercely crowded. Then an ingenious guy built a working demo of a wind-driven underground railroad…the first subway. But corruption let the air out of his idea.

The Backstory: The Horrifying Afterlife of Lincoln's Guests at Ford's Theater
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The Backstory: The Secret NASA Test That Almost Ended the Space Race
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The Backstory: Space Junk Falling From the Sky
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