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THE MATERIAL WORLD
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Quentin Cooper reports on developments across the sciences. Each week scientists describe their work, conveying the excitement they feel for their research projects.
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Contact Material World |
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LISTEN AGAIN 听30 min |
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PRESENTER |
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"For me science isn't a subject, it's a perspective. There are fascinating scientific aspects to everything from ancient history to the latest gadgets, outer space to interior decorating; and each week on The Material World we try to reflect the excitement, ideas, uncertainties, collisions and collaborations as science continues its never-ending voyage into the unknown".
Quentin Cooper |
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PROGRAMME DETAILS |
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| Artist concept of Gravity Probe B spacecraft in orbit around the Earth. Image credit: Stanford c/o NASA |
Polymers in Dentistry
X-rays are a routine tool in your dentist鈥檚 armoury, but what if there were a cheap alternative that could find tooth decay even earlier, and without the need to take a dose of radiation?
A collaboration between Heriot-Watt Biomedical Textiles Research Centre and the Dundee University Dental Health Services Research Unit has come up with a device that could potentially revolutionise the search for dental caries in your teeth.
A dental cavity has a lower electrical impedance than surrounding healthy tooth, and a special probe, thin and flexible enough to be placed on the surface enamel, can map the areas of decay with greater accuracy than an x-ray.
Dr Alex Fotheringham of Heriot-Watt University tells Quentin how his team came up with just the right material, and Chris Longbottom of Dundee describes how it works and the potential benefits.
Einstein Tests
As Radio 4 prepares for its short season of science plays on Saturdays, starting with Terry Johnson鈥檚 Insignificance, recounting a fictional encounter between Albert Einstein and Marilyn Monroe,听Quentin talks to two scientists who are looking to stars of another sort to test Einstein鈥檚 theories.
For three years, a three-quarter billion dollar satellite, Gravity Probe B, has been trying to measure the effect of the spinning Earth on the surrounding space-time.
And even as those results are awaited, its principal scientist, Stanford University鈥檚 Francis Everitt, is planning another satellite that will repeat Galileo鈥檚 experiment of dropping weights from the Tower of Pisa, high up in orbit.
Quentin hears the details from Francis Everitt and his UK collaborator Tim Sumner.
NEXT WEEK:听听听Urban Ecology, Science under dictators...
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RELATED LINKS
Radio 4: The Saturday Play
大象传媒 Science & Nature
大象传媒 Radio 4 Science programmes
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