And the Hello and welcome to the naked scientist with me Chris Smith and also with Georgia Mills.

This week we toe the line between life and death. We learn lessons from those who survived without oxygen for hours,

discover how we could live as robots on distant planets, and hear about a very special type of cryo ambulance to prep you for long-term storage.

Sounds intriguing. Plus, the science stories that are making headlines including how your finger length

can predict your marathon time and we'll be finding out why the Dutch

have grown nearly a foot taller.

The Naked Scientists Podcast is powered by UKfast. Co-D.K.

It's not exactly Pacini, but do you recognize this song? That's the swooping song of a pair of Larr Gibbons, which

intrigued Durham University primary researcher Esther Clark. She set off to the

Far East to study their elegant melodies, but then she noticed something a little unusual in the quieter so-called who-hoo calls that the Gibbons were making as she explained to Kat Arnie. Originally I was interested in Gibbons were making as she explained to Cat Arnie.

Originally I was interested in Gibbons songs which is what we know a lot about.

They're very loud, long distance communication between groups

but while I was following them in the field I noticed that they were making all these very quiet noises as well.

And everyone seemed to know about them as well.

Everyone who studied Gibbons, but nobody knew what they meant and what they were before.

And so this gave me the idea to try to record some of these quiet calls and try to analyze them.

So this is more like kind of Gibbon chit-chat rather than shouting.

Exactly, this is the kind of talk, you know, amongst themselves between close family members. It's not something you can hear from far away.

What sort of things do you think the Gibbons are trying to communicate with these close-range calls?

It's interesting because they make them all the time.

So I subdivided them into about nine different contexts and I was able to analyze calls from six of those where I had big enough sample size.

And these are things like meeting a predator, for example a ground predator like a clouded leopard or a tiger or an aerial predator like an eagle.

...