Two studies show that larger groups of people are better at maintaining and improving cultural knowledge.
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References
Muthukrishna, M., Shulman, B. W., Vasilescu, V. & Henrich, J. Proc. Roy. Soc. B http://dx.doi.org/10.1098/rspb.2013.2511 (2013).
Derex, M., Beugin, M.-P., Godelle, B. & Raymond, M. Nature http://dx.doi.org/10.1038/nature12774 (2013).
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Yong, E. Bigger groups mean complex cultures. Nature (2013). https://doi.org/10.1038/nature.2013.14158
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DOI: https://doi.org/10.1038/nature.2013.14158
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