May I have your attention please you can now book your train tickets on Uber and get

10% back in credits to spend on your next Uber ride so you don't have to walk home in the rain again.

Trains, now on Uber. T's and C's apply. Check the Uber app.

This is scientific American's 60 second science.

I'm Christopher and Tagata.

Much like modern humans, the Neanderthals roamed widely throughout Europe.

We know this because they left behind extensive evidence, usually bones or tools.

But their cousins, the Denisovans, are more mysterious.

Until recently, they were conclusively linked only to a single cave in southern Siberia called Denisova Cave which lies between Kazakhstan and Mongolia.

In that cave scientists had found a finger bone, three teeth, and a piece of skull,

which tipped them off to the existence of a whole new lineage of ancient human.

Now scientists have uncovered more of the range of the Denisovins, says Deendo Masilani of the Max Planck Institute in Germany.

His team turned up evidence the ancient humans occupied a high mountain cave on the Tibetan

plateau called Baishia Cave.

The cave belongs to monks and monks thinks that it's a very holy place.

In fact, a monk found a piece of jawbone there in 1980,

which has been tenuously linked to the Denisovans.

But Masilani and his team have now unearthed more conclusive evidence

by sifting through cave sediments and sequencing the genetic evidence

the Denisovans left behind.

Body decay or people just being there on the site like bleeding there or pooping peeing there, they could left their DNA.

The DNA appears in layers, suggesting that Denisovans

...