Zac Vawter used his bionic leg to climb 103 floors in Chicago's iconic Willis Tower. The Rehabilitation Institute of Chicago, where Vawter is receiving treatment, sponsored the charity stair climb. ... more 
Zac Vawter used his bionic leg to climb 103 floors in Chicago's iconic Willis Tower. The Rehabilitation Institute of Chicago, where Vawter is receiving treatment, sponsored the charity stair climb. (Nov. 5) less 
1 / 18
Associated Press Videos
Mon, Nov 5, 2012 3:17 AM EST