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