Zac Vawter, a 31-year-old software engineer from Seattle Washington, climbs 103 floors to the top of the Willis Tower using the worlds first neural-controlled Bionic leg in Chicago, as Physical therapist aide Suzanne Finucane (L) looks on November 4, 2012. 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 throughs. REUTERS/John Gress

Bionic Man

Many of us would complain that it’s a burden to ascend three floors, but for Zac Vawter, climbing to the third floor of the Willis Tower today was an accomplishment and making it to the 103rd floor was historic.

Dr. Annie Simon (R) and Physical Therapist Aide Suzanne Finucane (L) remove sensors from Hailey Daniswicz's leg at the Rehabilitation Institute of Chicago's Center for Bionic Medicine April 13, 2011 Daniswicz was flexing muscles in her thigh as electrodes attached to her leg instructed a computer avatar to flex its knee and ankle -- parts of her own leg that have been missing for 12 years. Daniswicz, a sophomore at Northwestern University who her lost her lower leg to bone cancer, is training the computer to recognize slight movements in her thigh so she can eventually be fitted with a "bionic" leg -- a robotic prosthesis she would control with her own nerves and muscles. REUTERS/John Gress

Bionic Woman

Today, Reuters released a set of photos that I shot and a story about researchers in Chicago working with electromyography — electrical signals produced by muscles — and pattern recognition computer software to control and develop a new generation of robotic limbs.