The Hello, welcome to the naked scientists coming to you from two sides of the world, Perth in Western Australia and Cambridge in England.

Here in Cambridge will be bringing you the latest science news, including how scientists

can predict whether groundwater is contaminated with arsenic and what effects does sugar have on our

willpower.

Meanwhile here in Australia we meet the dolphins that live in the river in the centre of a city, we find out how DNA technology is preventing

birds hitting aeroplanes, and how to educate kids who live a thousand miles from school.

We deliver a naked scientist's lesson for the outback.

If you'd like to get in touch with this, you can email Chris at the naked scientist.

com, you can tweet at Naked Scientists or you can look us up on Facebook.com slash the Naked

Scientists.

The Naked Scientists podcast is powered by UKfast.co. UK.

Hello I'm Kate Lamble and I'm joined here in Cambridge by Ginny Smith to take a look at the science

news that's hit the headlines this week. So Ginny, what have you got for us?

Well, this is an interesting study that actually refutes something that we thought we found out a little while ago.

So researchers thought that willpower was something that got used up,

so after you'd done a difficult task task it got harder to do another difficult

task and that you could reinstate your willpower by having some sugar, some

glucose but actually they've now found that this is only the case for people who think that

willpower is a finite resource. So if you think that your willpower will get used up,

it will and then sugar will give you a boost. But if you believe that willpower

is maybe like a muscle that gets stronger when you exercise it so actually you feel

invigorated after a difficult task, then you don't need the sugar and you can carry on at that pace.

...