Half a croissant, on a plate, with a sign in front of it saying '50c'
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Freeze and Boil rock drill

A boiling hot and then ice cold water stream drills into concrete or rock
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Together with the thin powerful flow, the pressurized streams of alternating freezing-cold and boiling-hot water cut into the rock or concrete breaking it up bit after bit and removing the pieces.
pashute, Jan 01 2024

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       You won't get a straight line. [+]
Voice, Jan 01 2024
  


 

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