Khan and his team used this idea to build the Sears Tower in Chicago. It had 110 stories. It was the tallest building in the world in 1973. Today it is called the Willis Tower. It is not the tallest building in the world today. But it is still the tallest building in Chicago. People still use Khan’s idea to build tall buildings today.
What Do You Think? Ask an adult to help you find pictures of some of Khan’s buildings. Which one is your favorite?
Photo Credit: Jonathan Weiss/Alamy Stock Photo
