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You're listening to a celebration in the Levenoffie village in the remote highlands of the island nation of Papua, New Guinea.

I was here with our Scientific American video crew last year to make a documentary.

I and my co-producer Caso Harper didn't know what any of these words meant.

But as the entire village, men, women, kids, grannies, swung their hips, waved branches,

and sang in this beautiful heartfelt chorus, we knew intuitively that we were being welcomed.

After all of the singing, we were invited to partake in a moo-moo. It's this delicious

feast that's made from wrapping meats and vegetables and spices in banana leaves and then cooking

them in this massive earth oven with steam and hot stones. Finding myself here, in an island nation

that's home to more than 300 tribes and about 850 different languages,

was one of the most remarkable experiences of my entire life.

Papua New Guinea also happens to be the most linguistically diverse place on Earth.

But that incredible diversity is declining.

Half of the roughly 7,000 languages spoken today could be gone by the end of the century.

And Papua New Guinea, which hosts more than 10% of the world's languages,

is now finding its own linguistic diversity under threat.

After this experience, I had to learn more.

Where have we lost languages in other parts of the world and how have they been forgotten?

...