Brazil's tight presidential runoff pits a political giant against a Bolsonaro heir in a battle over the country's political future.

(Image credit: Evaristo Sa and Gledston Tavares)

The Iguazú Falls span more than a mile across both countries. A rain-soaked October, which scientists link to the Super El Niño, has sent near-record volumes of water surging over the towering cliffs.