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Zombocom… the only limit is your imagination.

In all seriousness, rock crushing is energy intensive relative to just taking sand from the source.

Create a bag of rocks and leave them in an area with lots of waves.

Let nature and physics do the rest.

In a few million years

Pretty sure this is a joke but you never quite know, given that HN is infamous for these "javascript programmer applies his smarts to something that's not javascript" moments.

"bag of rocks" is so ridiculous that I would call it a joke for sure.

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