Lyric Mariah has two prosthetic legs — one named Bertha, for sneakers, and the other, Tina, for high heels — and they’re taking the Internet by storm. Now a model in London, Mariah has amassed more ...

State-of-the-art prosthetic limbs can help people with amputations achieve a natural walking gait, but they don't give the user full neural control over the limb. Instead, they rely on robotic sensors ...