Andrew Huberman· PhD
So if and hair is grow >> writing a grant after the grant. Yeah. [laughter] >> That was actually part of the data for that that study. I was one of the participants early on because we became interested in this. We found hair that were two colored two colors. The tip was dark and then the root was white. And then we thought oh if we can like figure out that hair transition and then if you measure it and you know how quickly the hair grow then you can say okay two and a half months ago right and you can look at the calendar and say about here this hair went from being dark to being white what happened in this person's life right so that was the idea uh and then uh back then my partner uh went to the bathroom and then she she brought back like she had very long hair and then you could see like clearly the same hair two different colors it's like aging hair graying is is there's plasticity here. And then we found hairs where the the hair was white and it went back to being dark.