00:11:00
The Rev. Stirling and heat engines
Roy Darlington explains the attractions of the remarkably simple Stirling engine
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01:02:00
Geoengineering: a brave new world?
This is a very new and rapidly developing area of science and technology and the proposals range from placing giant mirrors in space to reflect sunlight to fertilising the oceans with nutrients in order to produce more phytoplankton to soak up atmosp....
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