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It's infrastructure week on today explained on Monday we talked about politics on Tuesday

we talked about trains and today we're going to talk about toilets.

I'm Chelsea Wald, I'm a science writer in the author of a new book called Pipe Dreams

the Urgent Global Quest to transform the toilet.

Chelsea has traveled the world trying to understand toilets and she says the sewage system

in the United States is total crap.

The American Society of Civil Engineers has given US wastewater infrastructure a D-plus

which is a pretty low grade.

And there was only one way to find out how we ended up with that grade.

We had to flush ourselves.

The water will come out with the flash of the basin and go into the toilet bowl and push

...