March 17th, 2016
Episode 84 of 158 episodes
The largest dam in Iraq, the Mosul Dam, is in danger of collapsing according to a number of reports. It has been plagued with problems from the start as the dam was built on layers of limestone and gypsum - not only are these soluble but cavities form between the layers. The dam therefore needs constant grouting – the filling in of these cavities with a mixture of cement, clay and silicon – to stop it from collapsing. When the Islamic State group took control of the dam they destroyed much of this grouting equipment and many staff did not return once local forces had regained control of the dam. . Professor Nadhir al-Ansari from the Lulea Technical University in Sweden explains what could happen if the dam collapses. Exomars BBC Science Correspondent Jonathan Amos reports back from Exomars Mission Control. Curling ribbons Scientists from the University of Manchester can explain why a ribbon curls when we run a scissor blade down one side of it. As the ribbon bends around the blade, its outermost side stretches and permanently deforms, producing curls. Indonesia forest fires The dry season has begun again in Indonesia and so have the forest fires. Started deliberately to clear land for palm plantations, the fires led to record air pollution levels last year. Now the Indonesian government has new measures in place to keep the fires under control. Storks and junk food New research shows that white storks in Portugal appear to be addicted to junk food and have stopped migrating to Africa for the winter. Dr. Aldina Franco from the University of East Anglia has found that since the 1980’s a population of white storks in Portugal has foregone migration as they can get all the food they need from open landfill sites in the south of the country. This means they can repair their nests and be ready to rear young much earlier than their migratory counterparts. The population has now exploded to about 14,000 birds. However new EU regulations will soon mean the end of open landfill sites, as countries will have to recycle their food waste. How this might affect the storks is unknown and Dr. Franco doesn’t know if the new non-migratory generations will be able to make their way back to Africa if the need arises. (Photo: Mosul Dam. Deterioration of Iraq's largest dam could point to an impending catastrophic collapse which would unleash a wave that would devastate second city Mosul and flood much of the capital Baghdad. Photo credit: SAFIN HAMED/AFP/Getty) Presenter: Jack Stewart Producer: Ania Lichtarowicz Assistant: Lauren
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