The ink flows effortlessly through hair to reach the scalp, where it dries into a thin, flexible film. Once in place, the tattoo acts as a sensor, picking up brain signals with precision.

Previous e-tattoos have been applied by transferring them to the skin via a thin adhesive layer, but for most people, this won’t work on the scalp due to the presence of hair. So, Lu and the ...

Hair thinning affects millions of individuals worldwide, yet the complexity behind this common concern often goes unexplored. From genetic predisposition to environmental stressors, the causes of ...