There is one place on earth where you can discover the notion of "rattleback", find some natural rattlebacks, test them on the spot.
The possibility of "testing on the spot" is important, because first of all, it is what helps you discover that the very notion exists.
From the experimental archaeology session in this video, we won't hesitate :-) to assert that rattlebacks were discovered, by primitive human species, millions of years ago, on exceptional beaches, just like the one pictured in the video (Crovani / Argentella beach, Corsica).
Beaches of this type were probably few in number: you need to find absolutely smooth pebbles.
But over millions of years of evolution, no doubt :-) that, multiple times, our most primitive ancestors, made this discovery, while playing on one of those beaches, during their childhood :-)
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