Researchers may have solved the mystery of how caterpillars got their chubby abdominal "prolegs."

If you're a runner who likes to wear thick, cushiony running shoes, new reasearch is good news: They don't increase leg stiffness.

One problem with leg prostheses is that they can feel too heavy. Connecting a prosthesis to the nervous system can change that, researchers say.

There are animals with two, four, six, and eight legs, but none with three. A new essay digs into why that is.

To find out more about how people respond to stumbling, and to eventually create better prosthetics, scientists had to trip people 190 times.