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In this edition: What makes a healthy environment, the final steps to eliminate polio, and a test for proper cleaning.

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– We discover that life expectancy in England was dropping even before the pandemic, and celebrate Imperial physicists building an instrument for a new NASA mission.

– We chat to researchers who interviewed underrepresented groups about what they thought made a healthy environment, and what research they would like to see to help these environments thrive.

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– To mark World Polio Day on 24 October, we find out from Imperial researchers how close the world is to eradicating the disease, and what still needs to be done.

– We meet the Imperial-alumni makers of Fresh Check – a colour-change solution that can tell if a surface has been properly cleaned – and find out where they’re taking the company next.

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The podcast is presented by Gareth Mitchell, a lecturer on Imperial's MSc Science Communication course and the presenter of on the BBC World Service, with contributions from our roving reporters in the Communications and Public Affairs Division.