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"Comets are treasure chests about our own history"
Mark Mardell speaks to Professor Mark McCaughrean from the European Space Agency
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Listen to a selection of clips from recent and upcoming programmes.
More clips from 14/11/2014
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Counter-terrorism measures "probably getting to the right place"
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"They had no fear at all of being caught"
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National Tutoring Programme: 'Could do better'?
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'The Christmas Pine' by Julia Donaldson
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Trump鈥檚 relationship with Science
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The impact of Covid on the US Economy
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