Zac Vawter, a 31-year-old software engineer from Seattle, Wash., pauses after climbing the stairs to the top of the 103-story Willis Tower using the world's first neural-controlled bionic leg in Chicago, Ill., Nov. 4. According to the Rehabilitation Institute of Chicago, their Center for Bionic Medicine has worked to develop technology that allows amputees like Vawter to better control prosthetics with their own thoughts. Vawter made the climb during the RIC SkyRise Chicago event, a fundraiser for the Rehabilitation Institute of Chicago.

Read more about Zac Vawter in a previous PhotoBlog story.

Video: Bionic man makes climb up 103-story tower