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News & Politics 200

Insight, analysis and expert debate as key policy makers are challenged on the latest news stories. From BBC Radio 4's Today programme

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Today: How does sunlight affect humans?

April 20th, 2015

Episode 290 of 1333 episodes

The colour of light has a major impact on how our body clock measures the time of day, according to research by scientists at The University of Manchester. It's the first time the impact of colour has been tested and demonstrates that colour provides a more reliable way of telling the time than measuring brightness. Dr Timothy Brown is the study’s lead researcher.

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