Dr Chris Smith and the Naked Scientist team present the latest science news, analysis and breakthroughs,

In this week's episode...what the structure of your retina reveals about your risk of developing a range of different diseases, have we finally cracked how the first biological cells appeared 4 billions years ago? And how pond skater insects survive potentially lethal run-ins with large raindrops. Plus we’re continuing our “Titans of Science” series, this week we interviewing Wales former Chief Scientist and Alzheimer's guru, Julie Williams.

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