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how can you cut rock without a saw

the clue
We're Mike and Victor and we figured we could use acid to eat away at the rock. We searched our kitchen cupboard and found a bottle of vinegar. With our safety goggles on, we dropped vinegar on a piece of limestone. The vinegar fizzed a little. We concluded the vinegar did eat away some of the rock, but it was slow and using chemicals can be dangerous. Do you have any other ideas?
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