The events of 9/11 as they unfolded through actual audio.
U.S. Navy Railgun Makes Public Debut
The railgun, a futuristic electromagnetic weapon that can fire a projectile at seven times the speed of sound, makes its public debut at the the U.S. Navy's Science and Technology Expo. Katharine Jackson reports. Credit: https://www.youtube.com/channel/UChqUTb7kYRX8- EiaN3XFrSQ