The Winter (at 30 degrees Celsius) Course on Panel Data Econometrics took place at Universidade Estadual de Maringá (UEM), Paraná, on August 27 and 28, 2024. The course was taught by Alexandre Gori Maia from Universidade Estadual de Campinas. These happy graduate students and professors from UEM and UEL (Universidade Estadual de Londrina) in the picutre attended the course. Topics included regression analysis with cross-sectional data, omitted variable bias, pooled regression, fixed and random-effects estimators. Maringá is not only a pleasant place to live and study but is also known for having the best hot dogs in the world.