1. Why do we have three rational number notations? The importance of percentages <br>Robert S. Siegler and Jing Tian<br>2. Calibration and recalibration of stress response systems across development: Implications for mental and physical health<br>Megan R. Gunnar and Mariann A. Howland<br>3. Parental sexual orientation, parental gender identity, and the development of children<br>Charlotte J. Patterson<br>4. Environmental influences on early language and literacy development: Social policy and educational implications<br>Meredith L. Rowe<br>5. Kindness towards all: Prosocial behaviors to address U.S. Latinx youth social inequities <br>Gustavo Carlo, George P. Knight, and Alexandra N. Davis<br>6. Pathways for engaging in prosocial behavior in adolescence <br>Eveline A. Crone, Sophie W. Sweijen, Lysanne W. te Brinke, and Suzanne van de Groep<br>7. Gaze following in infancy: Five big questions that the field should answer <br>Kim Astor and Gustaf Gredeback<br>8. Young children's cooperation and conflict with other children <br>Dale F. Hay, Amy Paine, and Charlotte Robinson<br>9. Temporal approaches to the study of friendship: Understanding the developmental significance of friendship change during childhood and adolescence <br>Julie C. Bowker and Jenna Weingarten<br>10. The development of metacognitive knowledge from childhood to young adulthood: Major trends and educational implications<br>Wolfgang Schneider, Catharina Tibken, and Tobias Richter<br>11. Learning about others and learning from others: Bayesian probabilistic models of intuitive psychology and social learning <br>Rongzhi Liu and Fei Xu<br>