(CNN) — Amy Pietrafitta has learned to walk seven times. First was as a child and then after an industrial burn led to the amputation of her left leg in 2018. Since then, she’s had “first steps” in ...

BEFORE HUGH Herr became a professor at the Massachusetts Institute of Technology (MIT), he was a promising rock climber. But after being trapped in a blizzard during a climb at age 17, he lost both ...

Ever since Hugh Herr lost both his legs to a rock-climbing accident, he’s been on a quest to design replacement limbs that feel like the real thing. It’s now possible to engineer light-weight custom ...

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He’s in shape, so it shouldn’t be a surprise he’s going to attempt to climb the 103 flights of stairs inside Chicago’s Willis Tower this Sunday. “I ran track and cross country in college.” But Zac ...