NARRATOR: Today, Yusuf is in Hertfordshire to meet Pollyanna, a 12-year-old girl with a love of ballet. POLLYANNA: I first got into ballet when I was four. I want to be a dancer when I grow up.

Bentley, the golden retriever, is just a few weeks away from getting his custom prosthetic leg ... School has a class focused on computer-aided design and 3-D printing. The teacher, Todd Johnson ...

When sport enthusiast Van Phillips lost his foot in a water-skiing accident, he decided to design a prosthetic leg that allowed him to keep running. In 1984, he made the first prosthetic running ...