'Grandmother hypothesis' takes a hit

Pinning longevity to benefits women bestow on their grandchildren may not be plausible.

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Kachel, A. F., Premo, L. S. & Hublin, J.-J. Proc. R. Soc. B doi:10.1098/rspb.2010.1247 (2010).
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Authors

Ewen Callaway
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Callaway, E. 'Grandmother hypothesis' takes a hit. Nature (2010). https://doi.org/10.1038/news.2010.430