He’s in shape, so it shouldn’t be a surprise he’s going to attempt to climb the 103 flights of stairs inside Chicago’s Willis Tower this Sunday. “I ran track and cross country in college.” But Zac ...

(AP) Zac Vawter considers himself a test pilot. After losing his right leg in a motorcycle accident, the 31-year-old software engineer signed up to become a research subject, helping to test a ...

CHICAGO - Researchers have come up with new technology that may one day help amputee war veterans: an artificial leg that reads brain signals, and it's already being tested out. The bionic leg that ...

CHICAGO (AP) – The metal on Zac Vawter’s bionic leg gleamed as he climbed the 103 floors of Chicago’s iconic Willis Tower, becoming the first person ever to complete the task wearing a mind-controlled ...