A man with a mind-controlled bionic leg climbed the Willis Tower in Chicago Monday.
Zac Vawter, 31, climbed all 103 floors of stairs in the 1,451-foot skyscraper, formerly known as the Sears Tower, in 45 minutes as part of a charity event, reported The Associated Press. His goal to finish the climb was originally one hour.
“Vawter’s climb was the first public showing of a new kind of prototype prosthetic that is controlled, in part, by electrical impulses traveling from his brain,” according to the MIT Technology Review.
Vawter lost his leg in a motorcycle accident. The bionic leg, which is not yet available to the public, was built to react to electrical impulses from muscles in his hamstring.
“Everything went great,” Vawter told The Associated Press. “The prosthetic leg did its part, and I did my part.”
The prosthetic leg is powered by two electrical motors and weighs around 10 pounds.
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