Stripping down science, the naked scientists.

Hello and welcome to this week's edition of the naked scientists.

I'm Chris Smith and also here this week is Dr. Catani.

Hello.

And Dr. Dave Ansel.

Hi Dave.

Hi there. Now this week the Cambridge Science Festival has kicked off in a very big way and will be bringing

you a round up of the best of the fest, plus how scientists have solved the

mystery of why teenagers feel grumpy, and yes, whilst it's so unfair, it's definitely

not their fault.

We'll must be hearing how pigeons home, in other words, how scientists have found

magnetic particles in their heads that help them to navigate using the Earth's

magnetic field and also how caterpillars click before they're sick to ward off

predators. Cat.

Also this week we'll be finding out how scientists have sold a 4 billion year old mystery with the discovery

of a strange object lurking in the outer solar system. I think it might be my old biology teacher.

And we'll be talking to the man who's found the viral equivalent of a sarcophagus.

Apparently it protects insect viruses in the soil, but it might actually be the key to better vaccines in the future.

And in kitchen science I'll be doing the coolest experiment ever,

freezing a bottle of fizzy drink in front of your very eyes just by opening it.

Find out how to do this at home in just a few minutes

time. And if you're in the mood to win some stuff, we've got a fabulous mud-powered clock to

...