7.5M views · 65K reactions | The World Trade Center towers were once the tallest buildings in the world. But on 9/11, after being struck by a terrorist attack, they collapsed. Two scientists have thought of a new theory, which may finally explain what happened on that tragic day. The Missing Evidence: 9/11 Secret Explosions in the Towers airs tonight at 10 PM. | Smithsonian Channel | Facebook
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