@article {466957, title = {Understanding cumulative cultural evolution}, journal = {Proc. Natl. Acad. Sci.}, volume = {113}, number = {44}, year = {2016}, note = {Web Appendix}, pages = {E6724-E6725}, url = {http://www.pnas.org/content/113/44/E6724.extract}, author = {Henrich, Joseph and Boyd, Robert and Maxime Derex and Michelle A. Kline and Mesoudi, Alex and Muthukrishna, Michael and Adam T. Powell and Shennan, Stephen J. and Mark G. Thomas} }