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Brooks, let's get back into what you think the hollow earth might look like.

Well, we were starting to get ahead of ourselves.

I wanted to talk a little bit more about the seismology.

The first seismograph was actually put together in the late 19th

century. And as money became available, we built more and more of them around the planet. So we

started collecting seismographs. These are kind of printsouts of the timing of these vibrations

as they travel through the earth.

And we collected them for a long, long time.

And in 2006, Dr. Wysessions at Washington University, up in your neck of the woods, by the way,

put together a grant and I guess fed his grad students warm pizza.

And they went through 600,000 of these seismograms and put them into a program to try to create an image of what the inside of the planet looks like.

And what they discovered was the damping waves of an ocean, the size of the Arctic Ocean, underneath the

crust of the Atlantic Ocean.

These are waves crashing on the shore inside the planet.

Well, that sent shockwaves through everybody.

2006 was kind of the awakening of not only NASA looking at the earth, but other sciences

and other scientific organizations looking at the earth saying what the heck's going on

beneath our feet.

Of course, we don't have a way to actually directly measure, so we have to remotely measure what's going on inside the planet.

And fortunately, around the turn of the, I guess, the 2000s, we started to develop what's called a fast X-ray spectroscopy.

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