Josh Clark

blow the glass in a certain way and throw the sand in there.

But sand is finicky, as you know, as far as humidity and moisture goes.

So you had to get the sand in there and you had to seal it up, but you couldn't seal it up with any kind of moisture because it would clump up.

So it's a little trickier to make an hourglass than you might imagine.

Yeah.

When it's humid out, the soap opera days of our lives never get started.

Right.

It's sad.

Was that the one you watched in college?

I think that's what people wrote in and said, yeah, I'm pretty sure.

I couldn't remember.

Okay.

So one of the other things humans do when they have an invention that's popular and widespread, they don't just shrink it down to a miniature portable size.

They also just show off.

They do whatever they can to make it even cooler.

And there were a succession of inventors in different parts of the world over the years that did some really neat stuff with, say, like water clocks.

One was a guy named Andronikos.

He was from Macedonia.

And he built what's called the Tower of Winds in Athens.

It's this, I think, hexagon or octagon made of marble that's 15 meters or about 45 feet tall.