You need some water. You open the faucet. And you wait. And wait.

You twiddle your thumbs. You wait for the first drop to come out of the tap so you can get water for drinking, cooking and cleaning. You wait for hours so that when the water comes, you're ready.

A lot of the time, nothing comes out.

That's the way water works — or, rather, doesn't work — in many parts of the world.

But in India, a group of young entrepreneurs based in Bangalore have figured out how to let people know when there's water on its way. And it's as simple as sending a text message.

One of history's greatest engineering feats is one you rarely hear of. It's the Inca Road, parts of which still exist today across much of South America.

Back in the day — more than 500 years ago — commoners like me wouldn't have been able to walk on the Inca Road, known as Qhapaq Ñan in the Quechua language spoken by the Inca, without official permission.

Donald Trump's Republican presidential campaign continues to lead in the polls, and this week Trump hired Sam Clovis to be his national campaign co-chairman. A week ago, Clovis worked for Republican rival Rick Perry. Clovis, a former radio talk show host and college professor, is an Iowan who has run for state treasurer and the U.S. Senate there. He Talked to NPR's Scott Simon from Sioux City, Iowa.

To hear the full conversation, click the audio link above.


Interview Highlights

On why he left Perry to work for Trump

In one of several high-profile cases that have drawn international criticism, a Russian military court has sentenced a Ukrainian film director to 20 years in prison for allegedly plotting terrorist attacks in Crimea.

The cases have provoked protests from human rights groups and Western governments, including the United States.

Updated at 12 noon ET

What's left of a disorganized Erika, no longer a tropical storm, has moved western Cuba after drenching the Dominican Republic and Haiti.

The remnants of Erika are expected to move across Cuba and into the southeastern Gulf of Mexico by Sunday.

The latest National Hurricane Center advisory says:

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