When Raquel Rubio’s 13-month-old baby developed a 102-degree fever last month, she rushed to the doctor. Her son, Liam, had been in Rubio’s apartment without air conditioning for several hours; Nuevo León, the Mexican state where she lives, had reached 109 degrees Fahrenheit that day. The fever in the region could easily be driving her son’s temperature. The doctor confirmed Rubio’s suspicions, sent her back home, and instructed her to bathe Liam and keep him hydrated.