Study pinpoints when bow and arrow came to North America

Radiocarbon results suggest a single origin and rapid diffusion through cultural transition networks.

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[Rirere]

Archery peeve: There's no fire involved in using a bow, so it's not "rate of fire" it's "rate of shot".
Other than that, really interesting article, but I was confused over the idea that introduction simultaneously over a large area corresponds to a single source.

As far as the terminology goes, the article is written for a layperson's understanding and so "RoF" seems fine as that is what the audience is most likely to have heard before. I understand the technical frustration but in this specific instance it's a distinction without a difference insofar as the understanding of meaning goes (unlike "speed" and "velocity").

On the second point: my presumption is that if a technology spreads via trade patterns/migration that it takes relatively short periods of time on anthropological scales (and so it will appear "decisively" after a particular point in time). The correlating reverse assumption would be that it is unlikely for codevelopment to occur at the exact same pace across multiple regions, and so we'd expect to see more distinct weapon examples at different dates rather than a cluster thereof.