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23rd Nov 2008

Burning Science Questions


Dave Ansell

Kat Arney

Chris Smith

This week we hear how lasers might replace X-rays as a way to see inside the body, we delve into the genetic code of the extinct woolly mammoth and hear about a government competition to exploit the power of the web to help people to find public toilets and post boxes. We also tackle your science questions including finding out why mosquiotoes don't transmit diseases like dirty needles, how animals cut their umbilical cords, whether it's better to drink red wine or grape juice and why cold tea tastes strange! Plus, Dave creates a ghostly one-way window effect in Kitchen science.

Listen Now Download as MP3 Podcast Enhanced Podcast, with pictures and chapters.
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News

Laser sees straight through you

US scientists have developed a new way to image tissue in unprecedented detail but without resorting to harmful X-rays. Harvard researcher Mark Niedre and his colleagues, writing in this week's PNAS, describe how they have used short bursts of very intense laser light to produce three-dimensional im...

Ponds going down the pan

A national survey of the countryside has shown that good quality ponds have vanished from many parts of the countryside, although there’s actually more ponds in numerical terms. And this could spell disaster for wildlife.  The Centre for Ecology and Hydrology carry out a Countryside Survey in ...

Super slippery material

If you are making a machine with moving parts you often want to make parts slide past each other efficiently. Normally this is achieved by covering the parts with oil or another lubricant which can significantly reduce the friction but this isn't that effective, and the lubricant can escape. There&n...

Hearing the Light

A breakthrough in the way laser light interacts with nerve cells could greatly improve the quality of hearing for people who require cochlea implants. A healthy inner ear contains many thousands of hair-like cells which detect sound and pass a signal on to nerve cells, which then transport the sign...

Woolly mammoths reveal genetic secrets

Scientists at Penn State University have made a giant leap, or should that be a slow lumber, forward in genetic research by sequencing the genome of the woolly mammoth.  The team sequenced four billion bases, or letters, of DNA using the latest technology, and a new approach to read very old DN...

Switchable surfactants

It is often said that oil and water don't mix, but if you have ever done any washing up you will know that you can make them mix by adding a detergent, which allows the water to dissolve all those stubbon stains. This sort of thing is often done in chemistry, possibly to allow some catalytic nanopar...


Questions

Why can’t mosquitoes transmit diseases like dirty needles can?


How do water tablets reduce blood pressure?


From a scientific perspective, are there health differences between red wine and red grape juice besides the alcohol?


How do space vehicles pick up speed by using other planets’ gravity to slingshot them on their way?


Why do trees lose their leaves in temperate climates?


Why do objects in the distance appear to converge?


Why does tea taste different when it’s cold?


What’s the natural way of severing the umbilical cord in animals? We have plastic clips an pairs of scissors.


Why doesn’t the moon have a magnetic field?


 

What do hospitals do with amputated tissue?



Kitchen Science

Ghostly Windows

Make you and a friend seem to appear and dissapear or even stand in the same place, just using a piece of glass.


Listen Now Download as MP3 Podcast Enhanced Podcast, with pictures and chapters.

Quest for the Best Public Information Website

We hear about a recent government competition to help us make better use of the web.


Would a helium balloon float on the moon?

At a lunar birthday party, would the helium-filled balloons float?




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