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A wall currently separates the Nant Clydach tributary from the street, but the environment body, Natural Resources Wales, said building a raised flood defence wall was "not economically viable".
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Throughout their mission there have always been spacecraft attached to the space station to get them - and the rest of those onboard - home if there was an emergency.
Nature, Published online: 25 February 2026; doi:10.1038/s41586-026-10163-w