Dr. Martin Picard

So, we bought one of those high-end scanners and then we could iron out like a single hair, tape it down and then like scan at super high resolution.

So, then we can get like a digital picture.

readout of the hair like tree rings and then you could see okay the hair was dark and there's actually information there's like it looks like EEG almost but we're looking at hair color and then it lost color so then you can say okay this is the point and then we needed something similar for psychological states right what happened in this person's life ideally you would get blood or saliva or something else but we could go back in time with this and then I sat down with this participant and said okay

This is now, and this is a year ago.

And then you can look at your calendar.

What was the most stressful part of the past year?

And then for her, it was very clear.

And then what was the least stressful part of the last year?

And then people would rate this.

The y-axis is most stressful at the top, the least stressful zero at the bottom.

And then they put points and then connect the dots with the line.

So then you end up with a line graph of someone's

recall of their stress levels anchored in some objective life events.

So that was the methodology we use.

And for her, she had sent us the hair a few months ago.

And then we were doing the interview.

And her profile was so beautiful.

And she said, I submitted my thesis.

She just graduated her PhD at Stanford, actually.

And then she