The Traitors: psychology of knowing who to trust

The Faithful’s dilemma: why some facial features make you look more trustworthy. The brain cancer blood test that could speed up diagnosis and treatment. Apple begrudgingly accepts EU ruling on third party app stores. Also in this episode:

• Ingenuity helicopter's Mars mission is over
• The new weight-loss injection approved for the UK
• Instagram’s ‘Flipside’ feature lets users create private profile
• Astronomers spot ‘old smokers’ among hidden stars
• Swapping shells for bottle caps: how Hermit crabs are 'wearing' our plastic rubbish

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