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"A network of radio telescopes across the country would listen for the alien equivalent of Hancock's Half Hour"
"Poor air quality linked to premature deaths, with London one of the worst cities in Europe for some pollutants"
"Droughts, floods, sea-level rises and fiercer storms likely to undermine progress in developing world and hit food supply"
"The oxygen was either produced by life forms or by a chemical reaction in the atmosphere of Mars"
"US space agency recruits four women among its eight new candidates, the highest percentage yet selected"
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