Dr. Martin Picard

And then if you could find a hair that was dark, so the tip of your hair used to be inside the body.

It's a bit like tree rings.

If you cut down a tree and you look at the tree rings, you can basically go back in time and say, ooh, 20 years ago, there was a fire here.

And then 45 years ago, there was a drought.

And the tree rings look different.

Yeah.

So there's information encoded in the structure, right?

So we all walk around with kind of a molecular record, like a physical timeline of our biological history.

That was actually part of the data for that study.

I was one of the participants early on because we became interested in this.

We found hair that were two colors.

The tip was dark and then the root was white.

And then we thought, oh, if we can figure out that hair transition.

And then if you measure it and you know how quickly the hair grows, then you can say, okay, two and a half months ago.

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?

So that was the idea.

And then back then, my partner went to the bathroom and then she brought back, she had very long hair.

And then you could see clearly the same hair, two different colors.

It's like, shit, aging.