How Aluminum May Have Collapsed the Twin Towers

Aluminum, a principal material used in planes, is softer, lighter and more flexible than iron or steel. It could also be the reason the twin towers fell so quickly. Watch the Full Episode with your FREE trial for Smithsonian Channel Plus by signing up today at https://watch.smithsonianchannel.com/ From: THE MISSING EVIDENCE: 9/11 Secret Explosions in the Towers http://bit.ly/1hhMyEr