AUTHOR=Munoz-Rubke Felipe , Vera-Bachmann Daniela , Alvarez-Espinoza Alejandro TITLE=Learning Math: Two Principles to Avoid Headaches JOURNAL=Frontiers in Psychology VOLUME=10 YEAR=2019 URL=https://www.frontiersin.org/journals/psychology/articles/10.3389/fpsyg.2019.02042 DOI=10.3389/fpsyg.2019.02042 ISSN=1664-1078