A test launch of the UK’s Trident nuclear missile has ended in failure for the second time in a row. 

We hear from one of the University of East London scientists behind a heart disease breakthrough - where they’ve grown a 'heart in a dish' using stem cells. 

Nasa seeks US volunteers for a paid one-year ‘mission to Mars’.

Also in this episode:

• WikiLeaks: Julian Assange’s wife addresses crowds outside the Royal Court of Justice 
• Elon Musk says human implanted with Neuralink brain chip 'can control computer mouse just by thinking'
• Biggest snake species in the world discovered in Amazon rainforest
• Study suggests red light can reduce blood glucose levels
• Why using emojis or GIFs can help when delivering bad news at work

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