On this episode of the Big Brains podcast, an expert breaks down the secret conversations we have through our hand gestures.

A nearly invisible e-tattoo that attaches to the palm and connects to a smart watch can tell when you're stressed out.

Sensors that gather data on how people use a prosthesis versus a transplant in everyday life after a traumatic hand loss could help personalize treatment.

The fossil hand of a 4.4 million-year-old skeleton could offer clues to how early humans moved and began to walk upright.

A treatment that combines physical therapy and a noninvasive way to stimulate nerve cells helps people with spinal cord injuries use their hands and arms.

A new device that can recognize hand gestures based on electrical signals in the forearm could one day control prosthetics.

A new device called HandMorph can help adults get a taste of what it's like to interact with the world as a child, researchers say.

A new robotic hand may offer just the right touch for automated packaging, medical applications, and picking fruit.

The method could help give surgeons more feedback about how close they are to soft tissue during robot-assisted surgery, researchers say.

"We found that children who had been coded at some point with physical abuse were more likely to have also been brought in for treatment of a fingertip injury."