This study examines preservice preschool teachers' university science education experience. The empirical data are from a research and intervention project conducted on teacher education programs at two Swedish universities. We analyzed one of the assignments completed by 111 students within a science course as well as their conversations about the assignment at a number of seminars. We combined culture contrast and thematic analysis to examine the data. The results showed a tension between the preschool culture and the university science culture. We described this tension between the boundary lines of the two cultures as a chafing borderland. These cultures do not merge, and the defined boundaries cause chafing with each other. We discuss ways of diminishing this chafing of borderlands, potential border crossings such as caring and children as boundary objects and equalizing power imbalances.