Chimpanzees return favors at a personal cost http://www.pnas.org/cgi/content/long/1700351114v1 …
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Replying to @evantthompson
Any recommendations for accessing this type of material w/out a pay wall? (Just heard Richard Davison reference this on Upaya podcast)
1 reply 1 retweet 1 like
Replying to @BillBoyle24
Try using http://unpaywall.org/
6:27 AM - 20 Jun 2017
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