In Manaus, a sprawling city of more than 2 million, the depth of the Rio Negro, a major branch of the Amazon River, reached ...

Deep in the Amazon rainforest, a mysterious river stays at near-boiling temperatures year-round, baffling scientists. How is this possible, and what forces are keeping it so hot? Discover the ...

Instead, the researchers suggest that the behavior is used in social contexts. Amazon river dolphins possess bristles on ...