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dekhn • yesterday at 7:33 PM • 1 reply • view on HN

And sailing stones, https://en.wikipedia.org/wiki/Sailing_stones and toneballs https://luthierblogmartinahawe.wordpress.com/toneballs/

Replies

accrual • yesterday at 11:10 PM

I like how they installed a GPS module into one of the rocks to track its path.