The Hello,

Hello, and this is.

Hello, welcome to the Naked Scientists with me, Chris Smith, and also with Cat, Arnie.

Hello, and this week we're zooming in on the subject of nanoparticles to examine how tiny objects

smaller than the wavelength of light are making really large waves in the world of health and material science.

Plus the experimental allergy treatment that's been helping sufferers to stop panicking

about eating peanuts and the genetically modified purple tomatoes that could be making their way to your dinner plate very soon.

And our scientific teaser for this week, we would like you to tell us,

the cells in the human body are outnumbered a hundred to one by what? If you have any questions or

comments for us here at the naked scientist you can email me Chris at the

naked scientist.com or you can tweet at Naked Scientists.

The Naked Scientists Podcast is powered by UKfast.co.uk. And let's kick off with a look at the science news headlines as we always do.

Cats at what have you had your eye on this week? Now there's been an absolutely

incredible story this week my

background is in developmental biology and stem cells and I thought this this just

just knocked my socks off basically this week in the journal nature

researchers in the US and Japan have published a quite extraordinary

and potentially groundbreaking paper showing that cells can be switched back into a stem cell-like

state just by giving them a brief shock with acid.

Now, this is not LSD.

No, no, no, this is acid, a pH about 5.7.

Now previously Nobel Prize winner Shinya Yamanaka had found that if you add four specific molecules to cells you can

...