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Against all the odds, he re-emerged in the new millennium to delight his old fans and capture a new generation of music lovers.

The Ministry of Gender Equality and Family, which Yoon had wanted to shut down, has also re-emerged as a sticking point.

"Those two albums can still have their moments to re-emerge when the time is right," she added.

They found that the Martian valleys' branching angles "are more similar to terrestrial valley networks incised by overland flow, than valley networks incised by re-emerging groundwater flow."

BBC Verify examines why this pressure over public sector pay and industrial action has re-emerged.