[laughs]

... as he walked down with a cane, walked down these country roads.

It was, it was quite a sight.

So I went back to Duke, and I said...

One of my good cla- one of my classmates had been an undergraduate biomedical engineer at Duke.

And, um, and I asked him, uh, he's a pulmonologist now, Hopkins trained.

I asked him, "Y- you know, is there somebody around here who knows how to make a heart rate monitor of some kind?" And so he introduced me to one of his classmates who had gone, after Duke undergrad, had gone into graduate school in biomedical engineering at Duke.

Um, walk us down that path a bit, 'cause it's quite impressive what you have here.

So I just wanted to give you the opportunity to start with that.

Sure.

Um, um, let, let me start by saying a little bit about what I'm gonna do over the next 30 minutes or so.

Um, for 30 years or so now, those of us who've been trying to make old-fashioned, realistic, literal sense of the foundations of quantum mechanics have been struggling mightily with the question of what to make of the quantum mechanical wave function.

The trouble, in a nutshell, is that the wave function is a fantastically high-dimensional object, and that the business of admitting such objects into the inventory of the fundamental physical furniture of the universe would seem to require that the fundamental physical space in which the history of the world plays itself out is fantastically high-dimensional as well.

And that, in turn, raises a subtle and difficult question about how it is that that high-dimensional space might contrive to appear to us to have only three dimensions, that we take-- the, only the three dimensions that we take ourselves to move around in, in our everyday experience of the world.

And what I'm gonna be talking about here is a new picture of quantum mechanics, a picture that proposes to simply do away with wave functions, which is originally due to Jacob Barandes, who's here with us today, um, too.

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