Nasa is investigating a strange sonar-like pulsing noise reported coming from the hobbled Boeing Starliner spacecraft that’s left two Nasa astronauts marooned on the International Space Station. Blood stem cell lab breakthrough hope for leukaemia treatment. 

Also in this episode:

• Helping grieving elephant pack his trunk to make new friends
• $50 million funding for AI startups
• How large sharks hunt & eat each other
• What is ‘donut’ shape hidden in Earth’s core?

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