Only models built after May of 2017 qualify for the Top Safety Pick + award since initial crash testing revealed issues in the front - end structure, door hinge pillar, and door sill areas. (topspeed.com)
Rebound is movement after the initial crash. (thespruce.com)
Approximately 70 percent of these people worked on upper floors, but it has been estimated that 800 people in the north tower and 300 in the south tower survived the initial crashes and were trapped in or above the impact zones. (discovermagazine.com)