They will also occasionally walk themselves into corners and not be able to figure a way out.

CNN: SHARE THIS

Giffords is able to stand with assistance, but is not yet able to take steps or walk, said Rhee, adding that therapists are helping Giffords with ways to express her thoughts and, eventually, speak.

CNN: Giffords arrives in Houston

The study of a sustained release oral formulation of the synthetic form of prostacylin showed that patients treated for pulmonary arterial hypertension did not achieve a statistically significant improvement in how far they were able to walk within six minutes by week 16 of the trial.

FORBES: Pharma News: United Therapeutics, Zogenix, Par Pharmaceuticals

"I may not be able to run, but I'm going to try to walk it, " he says.

WSJ: This Season's Ticking Bomb

Ronnie recovered so quickly that he was able to not only see daughter Katie get married, but fulfil his promise to walk her down the aisle.

BBC: NEWS | Health | 'I wanted to walk down the aisle'