And the Hello and welcome to the naked scientists with me Greg Jackson and Chris Smith.

This week we're asking whether scientists and technologists are in short supply in the UK and other developed countries

and how the way we teach science in schools is changing. Some classrooms are even pumping out published papers these days.

Plus in the news this week scientists unveil a 2 metre long scorpion, the seabirds with stomachs stuffed

with plastic and the facts behind fat is butter really all that bad for you.

The Naked Scientists Podcast is powered by UKfast.co.uk. If you're lucky enough to visit the tropical forests of Central America, then you might

spot the highly distinctive bright blue wings of a morpho butterfly. And if you look really carefully you might see

their wings subtly switch in color in response to changes in the chemical

makeup of the surrounding air. Now taking his inspiration from these insects, Tim Starkey from the University of Exeter,

has developed a new form of sensor technology that works in exactly the same way,

as he explains to Catani.

Usually colours produced in one of two ways.

The most common one is through chemicals.

So for example, most of your clothes and the things you see around you

are created through pigmentation.

And that's where light comes in. Some of it's absorbed and what is reflected or transmitted to your eye you perceive as a color.

These butterflies create color through structure, so they're made up of lots of very thin layers

which manipulate light to give you a blue color.

What does the structure of these wings look like?

How do they look?

If you were to take one of these butterflies

and take a scale off, if you take a cross section and look at these sort of side on,

...