Unprecedented movement

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Zac Vawter's thought-controlled bionic limb, designed and developed by Vanderbilt University and used in conjunction with groundbreaking techniques at the Rehabilitation Institute of Chicago (RIC), allows for "activities unprecedented for any leg amputee," said lead researcher Dr. Levi Hargrove of the RIC.

That includes moving between sitting and standing up and ascending and descending stairs. Vawter took the leg to task last year when he climbed all 103 flights of Chicago's Willis Tower.