A lack of identifiable plane wreckage, among other anomalies, has helped fuel skepticism about the official explanation of Sept. 11 damage to the Pentagon, left. Here's more on that debate and a few other Internet-fueled conspiracy theories that still thrive
THE TOWERS' COLLAPSE
• THE CLAIM: Explosives brought down the Twin Towers. Critics of the official explanation point to such clues as the pattern and timing of dust and debris blown out from the floors, the vertical fall of the towers and two seismic tremors that coincided with their collapse.
• THE FACTS: The impact of the Boeing 767s damaged support...