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You're listening to shortwave from NPR.

Hey everybody. Maddie Sifai here with shortwave reporter, Emily Kwong.

Hey, Maddie. Hey you.

So Kwong, you've got a story today about the evolution of voicing.

That's right. Featuring the voice of this guy, a primatologist.

Hi, my name is Vrianna Lamayra. I'm an assistant professor at the University of

Warwick in the UK.

Adriano is one of many scientists chipping away at this long-standing idea

...