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Bad News for Ex-Smokers
Lung cancer risk for ex-smokers falls off with time but never quite goes away; is there water on Mars?; reading emotions in people's faces; insterstellar neutrino clocks imagined; frogs as parents.
大象传媒 World Service Archive
This programme was restored as part of the World Service archive project
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Science In Action
The 大象传媒 brings you all the week's science news.
