Stripping down science, the naked scientists.

Hello, welcome to this week's naked scientists with me, Chris Smith and with Dave Ansel.

Hi Dave.

Hi Dave. Hi there. Now this week, perfect for summer, how scientists have come up with electric sunglasses that

let you change how dark they are, sounds good.

Also how birds are avoiding radioactive nesting sites in Chernobyl sounds even better and

also how scientists have invented a near perfect anti-reflective coating.

Find out how it works in just a moment.

Also this week we're exploring the science of heart disease with Dr Neil Campbell from the London

Chest Hospital. He'll be joining us to explain what happens when someone has a heart attack and

some of the new methods that medicine has to prevent and treat this problem. Plus we'll be hearing from heart specialist

Anthony Mather on how stem cells could be used to repair damaged hearts and in

kitchen science Ben Vasler will be with Brian calling them to find out how

arteries respond to adrenaline and other drugs.

And if you're in the mood to win something and this will certainly be an

adrenaline experience we've got a fabulous mud-powered clock for the winner of

this week's teaser. What we want to know to the nearest million or so is how many times does the average

human heart beat in a lifetime? The Naked Scientists Podcast powered by UK Fast, the UK's best hosting provider on the web at UKfast.net.

How about this for summer day, the pair of sunglasses where you can actually change how dark they are.

It would be useful, I could.

Because most people say, well, why do you need that?

Because we've already got these sunglasses a sort of auto tint,

...