This dissertation brings new causal evidence on three topics in education and health. In the first chapter, I study how in-utero exposure to floods affects the education and health outcomes of individuals. I focus on the 1982-1983 El Niño event in Peru to exploit a natural experiment. I assess the impacts of plausible and exogenous in-utero exposure to excess rainfall on education achievement at adulthood. I find that individuals exposed in-utero to the 1982-1983 El Niño floods, have less chances to have completed primary education at adulthood with different effects by place of residence and gender. In the second chapter, I study how a low-cost face-to-face intervention, that exposed senior-year high school students to female role models affects career preferences and reduces the gender preference gap for STEM programs in Peru in a randomized controlled trial. I find that exposure to role models increased preference for engineering majors only for those girls in the top math ability quartile; and that the effect was stronger for those who reside geographically close to the role models' university. Finally, in the third chapter, I investigate how to optimally allocate students to academic programs. I evaluate external signals of ability transmitted to students by academic probation rules in Peru using a regression discontinuity design. The analysis suggests that academic probation is associated with higher drop-out rates from programs and a deterioration in subsequent academic performance. I conclude that in a society with predominant gender norms, signals of ability could aid to the retention of only qualified students in selected programs with further implications on aggregate productivity and the allocation of talent. / Doctor of Philosophy / This study sought to understand how exposure to different adverse events in life affects individuals' decision choices. I focus on a developing country, Peru, where returns to education are high and investment in human capital can improve individuals' lives. In the first chapter, I study how prenatal exposure to extreme weather conditions (i.e. the 1982-1983 El Niño floods in Peru) affected the education achievement of those individuals when they were older. This adverse and unpredictable event, affecting the evolution of babies while in-utero, during the nine months of gestation, reduced the probability that the exposed individual had completed primary education. In the second chapter, I implement an experiment in the field to understand the effect of the exposure to role models on the reduction of the gender gap in careers that are male dominated such as Science, Technology, Engineering, and Mathematics (STEM). The gender gap in STEM fields is a major cause of concern for policymakers around the world since it not only contributes to talent misallocation but also critically deepens gender-based socioeconomic inequalities. I find that a brief exposure to role models of about 20 minutes increases preferences for engineering majors of high talented female high school students, and I attribute this to inspiration rather than information mechanisms. The evidence suggests that, inspired by role models, high math ability girls had increased self-confidence for succeeding in engineering majors. Finally, in the third chapter I investigate the misallocation of students to academic programs and more specifically the effect of one university policy related to academic probation on attrition rates and subsequent academic performance. Academic probation is a warning received by students failing to make substantial academic progress required for graduation. By receiving academic probation, students get additional information of their capabilities to successfully complete a degree. The analysis suggests that academic probation is associated with higher drop-out rates from programs and a deterioration in subsequent academic performance aiding to the retention of only qualified students in selected fields of study.