PEE paragraph (WTC)

The reason there are concrete walls with steel reinforcing bars s to make sure that if something bad happens people can be protected. According to the info graphic, they use state of the art concrete used in 1 WTC can withstand almost three times more pressure than the concrete used in most other NYC skyscrapers. Because the buildings got hit by airplanes and collapsed, of course they would build the new one with a stronger structure.