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Dr Chris Smith and the Naked Scientist team present the latest science news, analysis and breakthroughs. This week: The regulator says the Alzheimer's drug Lecanemab is safe, but NICE say we can't afford it. The UK Ministry Of Defence launches its first Earth imaging satellite. And the �鶹��'s Frank Gardner on why the UK's butterflies need our help. Plus is there a link between some cosmetics and cosmetic trends and cancer? We examine this in more detail in the second part of the programme.