Ohio residents keep finding mysterious round rocks in their backyards; they're actually 360-million-year-old fossils in disguise

If you live in Ohio and have ever spotted a strangely round, heavy rock in your garden or along a creek bed, one that looks too smooth and too symmetrical to belong there, you are not imagining things. Residents across the state, particularly around Columbus, have been puzzling over these sphere-like formations for years, occasionally mistaking them for cannonballs or man-made objects.

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