Our tech reporter on Apple’s expected ‘mixed reality' headset announcement - its first entirely new product for eight years. Nasa invites you to sign its ‘message in a bottle’ that will fly to Jupiter’s moon, and Elon Musk snaps up another top NBCUniversal executive for Twitter.

Also in this episode:

• Research suggests fatal heart attacks are more common on a Monday
• Activist promoting carbon capture walks from London to Istanbul to mark World Environment Day
• 'Extinct' butterfly species reappears in UK
• Japan to launch satellite made of wood in 2024
• The secret to living to 100 may have just been revealed

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