She leads a very encrypted life.

So she sent her public encryption key to Snowden.

And then once he had really secure communication set up with her, he'd said,

this is what I know and I can prove it.

NSA leaker Edward Snowden demanded the highest security

before spilling his secrets about America's national security apparatus.

From WNYC in New York, this is on the media.

I'm Brooke Gladstone.

And I'm Bob Garfield.

Qatar-based Al Jazeera is poised to launch a new American-based channel,

but will Americans watch?

Some segment of the populations that are bigoted and biased

are always going to look upon them with suspicion.

And Pulitzer Prize-winning journalist Paul Salopek

is tracing the steps of our human ancestors from Africa to South America,

reporting things you can only learn on foot.

They looked at me as if I was stupid,

because what they were walking along were invisible boundaries of conflict

that only they

and their enemies could see.

All that and more.

Coming up next.

...