1. Develop low resistance to cold.
You’re wearing heavy coats on the bus. Your friend shows up with a wool cap and gloves. The morning newspaper screams “cold wave in São Paulo”. Temperature is around 15 C, but we will treat it as a new ice age. In a few days we’ll be drinking hot cocoa, the restaurants will be serving fondue, and girls will be rocking their best “legging + knee boots” look. True story.