Hunt for aliens: A University of Maryland–led team is developing a Nasa-funded zapper that can be easily tucked away aboard a spaceship. It uses an ultraviolet ray to scan Martian particles for organic compounds. Secret, huge magma chamber bubbling away near a tourist beach in Santorini, Greece - interview with team investigating discovery. Plus, China's population has fallen for the first time in 60 years.

Also in this episode:

-UK-Saudi solar plan to harness sun’s electrical power from space.

-How drinking milk helped the ancients grow strong.

-Can woolly jumpers help beat facial recognition?

-Ain’t no party like an AI party...with fake guests.

-Getty lawsuit ‘over AI images’.

-Yours for 47 bitcoins...the tasteful new ‘crypto house’.

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