In this photo provided by TED 2014 Conference, dancer Adrianne Haslet-Davis, left, performs on stage with dancer Christian Lightner at the 2014 TED Conference, in Vancouver, British Columbia, on March 19, 2014. Haslet-Davis took to the stage with a new prosthetic limb to perform for the first time since losing part of her left leg in the 2013 Boston Marathon bombing. (Photo by James Duncan Davidson/AP Photo/TED 2014 Conference)