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In the Solar System's outer darkness, planet Neptune has its first 'official' birthday.
BBC World Service Online
Dr Ben Goldacre explores the science of epidemiology, from the cradle to the grave
Professor Trevor Cox explores the world of sonic design applied to our outdoor spaces
New insights into why we age and how we might live more healthily for longer
Is there a test for how long you will live? Controversies in cutting edge ageing research
How a meteorite that landed on Earth 100 years ago is helping astronomers explore Mars