Lew-Levy, S., Pope, S. M., Haun, D. B. M., Kline, M. A., & Broesch, T. (2021). Out of the empirical box: A mixed-methods study of tool innovation among Congolese BaYaka forager and Bondongo fisher–farmer children. Journal of Experimental Child Psychology, 211: 105223. doi:10.1016/j.jecp.2021.105223.