Understanding the human body is a team effort. That's where the Yachtel group comes in.

Researchers at Yachtolt have been delving into the secrets of probiotics for 90 years. Yacold also

partners with nature portfolio to advance gut microbiome science through the global grants for

gut health, an investigator-led research program. To learn more about Yachtold, visit yacult.co.com.j

that's Y-A-K-U-L-T.co.jp. When it comes to a guide for your gut, count on Yacolt.

Archaeology can reveal shocking similarities between modern-day humans and our most distant,

ancient ancestors. But it just as often allows us awe-inspiring glimpses into feats our species

accomplished without the aid of technologies we now take for granted. It can also force us to confront

historical practices that shock our modern sensibilities

and leave us grappling with thorny ethical questions.

For Science Quickly, I'm Rachel Feldman.

You're listening to the final episode of our three-part fascination series on Extreme Archaeology.

If you're just tuning in, make sure to circle back to the episodes we posted last

Friday and the Friday before that. You'll hear about everything from the surprising sophistication

of prehistoric stargazing to the study of ingenious ancient fishing techniques that have persisted to this day.

Back again with us is the award-winning documentary filmmaker and journalist Katakara.

She's taking us on one more adventure, this time to the top of a mountain with a climate

so extreme it's practically alien, to introduce us to archaeologists who study human sacrifice.

Before we get started, a quick note about language. Ketua was the primary language spoken among the

Inca, and its varieties are widely spoken today in the Andean regions where the Inca Empire extended.

Throughout this episode, we use Ketua words where possible.

The pronunciations you'll hear reflect the way the language is currently spoken by the descendants

...