The UK Health Security Agency has confirmed Covid’s new Arcturus sub-variant has arrived in Britain. While presently there are under 100 known UK cases, it’s thought to be the most infectious strain yet. Interview with Ashley Johnson, CEO of Applied Atomics, the London start-up making space rocket fuel from water. Astronauts to live in Nasa’s fake Mars for a year. Once-in-lifetime bloom of Ethiopia’s edible tree at Kew Gardens, with research leader Dr James Borrell. Also in this episode:

• Universe’s cosmic growth map backs Einstein’s gravity theory
• Parkinson’s diagnosis technique breakthrough
• Clicking hell...mouse use link to stress levels

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