After leaving the hospital, he began to move -- at first pushing a shopping cart around the grocery store like a toddler learning to walk.

CNN: Man refuses surgery, drops 270 pounds

Despite the pain and the prospect of spending years re-learning how to walk with a prosthetic limb, Chidiac almost never loses her good spirits.

CNN: Hala Gorani: A postcard from Cairo

Initial users would be people learning to walk again after having a stroke.

WSJ: Bionic Brains and Beyond

We have national parks to provide access to these kinds of areas, but that does mean that people will effectively go for a walk in the park without perhaps doing the preparation work, getting kitted up, learning the necessary skills.

BBC: 'You must prepare for the hills'